Switching to Synthetic oil?

[Rocknthehawk]

I know this might sound stupid, but I'm not a mechanic by any means, and I've always had the train of thought that if I should use synthetic, my truck would have come from the factory with it. But, I'm probably wrong.

I've been thinking about changing over to synthetic, after reading about the benefits. Less wear, more power, longer intervals.

My Thunderbolt has the 4.0 SOHC, 33K miles. I've always used the factory recommended weight standard motor oil. In my thought of changing to synthetic, what do I need to do? Obviously there would be residual oil left after draining the pan. Should I switch to a synthetic blend for the first couple oil changes, or just switch to a blend and be happy?

Basically, what exactly do I need to do to switch, and should i use a full synthetic, or a synthetic blend?

I'd ask on the Ranger site i frequent, but it's down with a host of issues, and this is the most tech-savvy site i visit.

Thanks!

[RR|Suki]

I know this might sound stupid, but I'm not a mechanic by any means, and I've always had the train of thought that if I should use synthetic, my truck would have come from the factory with it. But, I'm probably wrong.

I've been thinking about changing over to synthetic, after reading about the benefits. Less wear, more power, longer intervals.

My Thunderbolt has the 4.0 SOHC, 33K miles. I've always used the factory recommended weight standard motor oil. In my thought of changing to synthetic, what do I need to do? Obviously there would be residual oil left after draining the pan. Should I switch to a synthetic blend for the first couple oil changes, or just switch to a blend and be happy?

Basically, what exactly do I need to do to switch, and should i use a full synthetic, or a synthetic blend?

I'd ask on the Ranger site i frequent, but it's down with a host of issues, and this is the most tech-savvy site i visit.

Thanks!

drain the old oil, put in synthetic, that's it. Blend or full is up to you and how much you want to spend.

[jgc61sr2002]

Exactly what he said.^^^^^ Use recommended factory blend. 5W20- 5W30 etc..

[guccijayda]

Not speaking of the recommended factory blend, but a complete change over from synthetic>regular. Some mechanics advise not to change over to regular from synthetic oil If the car was using synthetic oil originally for a long period of time(vice versa). They have recalled some engine problems starting from that. They advise you to use the same type of oil the car has been using especially if it's been using synthetic for over 40k miles or so. Again, I am just reinstating what mechanics have told me as I work side by side with them. I believe "mobile 1" came out with the top test results over all other manufactoring oil companies. I believe quaker state, and some other engine oil's did the most poorly on the tests.

My .02 cents.

[RR|Suki]

It's not the 50s anymore ;)

[guccijayda]

i thought it was the 80's :P

[grampaws]

Switching to synthetic is benificial regardless of
when you do it. If the motor burns or leaks a significant
amount of oil it would be to far gone to gain anything.
Top ups would get expensive!
But any good running engine would benefit.The newer
the engine the better the long term benefits.
just put in the recommended grade- oils can be mixed
without damaging the engine so just switching at your
next oil change-no problem.
I have never had a problem switching any engine from
regular to semi or full Synthetic.

[Rocknthehawk]

Thanks guys, I'll be doing it sometime this week...still not sure what brand or if i'll do a blend or full synthetic. I've heard royal purple is the best, but I don't know of anywhere around that carries it

[Marylandrauder]

Thanks guys, I'll be doing it sometime this week...still not sure what brand or if i'll do a blend or full synthetic. I've heard royal purple is the best, but I don't know of anywhere around that carries it

Try NAPA or Pep Boys, they both carry it in my area.

[sd8683]

Thanks guys, I'll be doing it sometime this week...still not sure what brand or if i'll do a blend or full synthetic. I've heard royal purple is the best, but I don't know of anywhere around that carries it


Aaron, Napa sells royal purple, its pretty expensive but I think its great oil!

[Peace2Peep]

napa carries royal purple and they are all over Mass...

[Peace2Peep]

That was one solid minute of good answers...wow! You guys are smart and FAST!

[RR|Suki]

Isn't the only fully synthetic royal purple the race stuff? which is super expensive... just what I heard though and I can't see full synthetic on the bottle anywhere (the $7 bottles). I'll be using Amsoil this coming change, I always used it in my bike and loved it.

[Rocknthehawk]

WOW!

haha thanks guys. I forget there's a napa here in town, it's a little hidden. Autozone and Advanced are both real close to my house, so anytime i need something, it's easier to run there.

[timfromme]

I only use Mobil 1 synthetic since the original owner used the same. Funny someone mentioned Quaker State. There was an ad a long time ago that "Quaker State engines never quit". I was watching NASCAR awhile back and that commercial was on, when it went back to the race, the Quaker State car blew its engine. I was ROTF LMFAO!

[TJCOX]

I used Amsoil and Mobil 1 and went extended mileage with both. If you're going to be
changing it at 3-4 K miles, I would use a blend. Eight dollars and plus a quart is extreme unless you extend the oil change intervals. Amsoil claimed up to 35K between changes as long
as you changed the oil filter and added a quart at certain intervals.
I normally change oil by color etc and not by the mileage factor.
Mobil 1 when first introduced , recommended at least 10K miles before switching to
full synthetic. Now however, many manufactures install the synthetics at the factory.
Always purchase the oils with the "Starburst" and they should perform well.
Just my personal opinion.
Good Luck and don't forget the transmission and other fluids as well.
I've used Castrol in my bike since 85 and the previous owner used it five years previously.
Tom

[guccijayda]

lol quaker state is a joke it scored the worst. And i advise you don't listen to none of those recommended oil change bs. Many oil manufactures have different rates as to when to change your oil but I'd rather be safe then sorry. Bmw says its ok to do an oil change every 15-20k miles? I know mechanics at the BMW dealer, they wont recommend it.
I work at a dealership. I worked at herb gordon dodge and subaru, Mile one nissan, and Darcars. Almost every mechanic that appreciates their car changes their oil every 1500 to 3000 miles no more then that. It's not only because it's cheap but because they know how important it is. We see many cars with built up sludge with engine damage to blown engines from people that ride out their oil too long. It's surprising so many people that come to the dealer spend so much money fixing their car but can't even do a $30 oil change on time.The sludge just keeps building up and permanently damages your engine over time. By consistently changing your oil on time is the best thing you yourself can do to. I change my oil every 2-3k miles but of course there is more forgiveness when using synthetic.

I see some people on this thread say changing a car that normally runs on synthetic( 50k miles for example) to regular has no ill effects. I don't think you are a mechanic but that you just say it from personal experience. Mechanics work on cars every day of their lives, you learn more from a mechanic then you ever can from auto tech classes. This topic is personal observations that many mechanics are familiar with and agree with. Many mechanics have told me this. When I was changing oil in my marauder my boss asked me to make sure what oil the car has been using because its not a good idea to switch back and forth synthetic to regular. People do it many times, but if you know what your car has been using then it would be a safer bet to stick with it. I think it's ok if you change from regular to synthetic, but you should stick with synthetic once you start.

[Marauderjack]

Mobil I since 10K miles......change it every 5K miles (easy to remember).....196K total miles and 112K miles with the blower......LIFE IS GOOD!!!!:beer::bows::D

[RF Overlord]

I think it's ok if you change from regular to synthetic, but you should stick with synthetic once you start.That's an old wives tale that refuses to die.

There is no issue with switching back and forth.

Way back in the early days of synth oils (mid 70's) there were issues with seal swelling due to incompatibilities with some of the additives used in the first synthetic oils, but those problems were solved LONG ago.

[RF Overlord]

I normally change oil by color etc and not by the mileage factor.Tom, trying to judge an oil's condition by its colour is a guessing game at best. It's entirely possible, in fact it's very likely, you are changing out perfectly good oil way too soon.

Just because an oil turns dark does not mean it's no longer usable. Some oils turn dark fairly early and it's completely normal...Mobil 1 is one example. It's also possible for a clean-looking oil to be past its prime due to additive pack depletion.

The current rule of thumb is 5,000 miles for conventional, 7,500 for a blend, and 10,000 for a full synthetic. This is, of course, subject to the engine's condition, driving habits, and any special considerations. In some cases, such as the infamous Volkswagen 1.8T, sooner is required, and in many cases the interval can be even longer.

[grampaws]

mobil1, amsoil and royal purple are all good oils.
you really can't go wrong. I use amsoil due to personal
involvement in racing and largely personal preference.
The only caution is some perf engines are required to use
semi or full syn and switching those engines to reg oil can
be damaging.But that is not your scenario.Pick one for
price and availability and you will be rewarded with the
longevity of your engine.

[grampaws]

I agree the manufacturers recommendations are only a guide.
real world conditions will dictate the oil change interval.
The color of the oil is a good indicator as to it life
expectancy- if its black you've waited to long.
when it starts to turn dark brown and it is still
translucent its time to change.Dirty oil will
defeat the benefits of a good oil.
Pull the dipstick and it will tell you when to change.
a good clean burning engine with highway miles will
have long intervals. mileage really does not indicate
the hours an engine has run. idling and sitting at stop
lights is still wearing your engine but mileage does not
count these instances!

[Egon Spengler]

Aaron... I had a 2000 Ford Ranger 3.0 Off Road Package... I just let the oil drain for quite awhile and got most of the old oil out and threw in the synthetic... made a difference!

[fastblackmerc]

I agree the manufacturers recommendations are only a guide.
real world conditions will dictate the oil change interval.
The color of the oil is a good indicator as to it life
expectancy- if its black you've waited to long.
when it starts to turn dark brown and it is still
translucent its time to change.Dirty oil will
defeat the benefits of a good oil.
Pull the dipstick and it will tell you when to change.
a good clean burning engine with highway miles will
have long intervals. mileage really does not indicate
the hours an engine has run. idling and sitting at stop
lights is still wearing your engine but mileage does not
count these instances!

Actually go here:

http://www.blackstone-labs.com/free_test_kit.html

Spend the $22.50 once a year to get your oil analysed. You'll get a recommendation on oil change intervals.

Otherwise there is too much guesswork involved.

[Seneca]

I switched to Amsoil 100% Synthetic, 5w30 when the car had 10k miles. I'm turning over 50k now. I change mine once a year cause i dont drive the car anymore then 3k miles a year, Like they said.. personal pref.

[grampaws]

Actually go here:

http://www.blackstone-labs.com/free_test_kit.html

Spend the $22.50 once a year to get your oil analysed. You'll get a recommendation on oil change intervals.

Otherwise there is too much guesswork involved.
These tests are a good idea and can indicate if there is
contamination or signs of destructive wear. But not really
necessary for the average driver. A test once in a while
would give you another indicator and I would not discourage
doing so.

[guccijayda]

I agree the manufacturers recommendations are only a guide.
real world conditions will dictate the oil change interval.
The color of the oil is a good indicator as to it life
expectancy- if its black you've waited to long.
when it starts to turn dark brown and it is still
translucent its time to change.Dirty oil will
defeat the benefits of a good oil.
Pull the dipstick and it will tell you when to change.
a good clean burning engine with highway miles will
have long intervals. mileage really does not indicate
the hours an engine has run. idling and sitting at stop
lights is still wearing your engine but mileage does not
count these instances!

Another thing you have to put into consideration is how long the car has been sitting. You can have a car that you only drove 2k miles but over a long period of time, say one year or more. That oil will still look very clean and clear, but is VERY OLD and therefore you would still need to change it. This is a common mistake people have when they buy cars. You never know how long that car has been sitting there with "new oil" and you don't change the oil for another year. My mechanic suggested me to change my oil on the honda accord even though it "looked clean". It's not unusual for dealer cars to have been sitting there for several several months.

[guccijayda]

I don't care what kind of synthetic you use, I wouldn't recommend changing it every 10k miles. "Amsoil, Purple, Mobile1" are all very good synthetic oil's and each have their own recommended guideline. Consumers are worried about prices, and manufacture recommended intervals to change your oil IS a part of that price and you will consider it when thinking of cost efficiency. Oil manufactures are in a very competitive industry and are advertising and "selling" you that product. Better to be safe then sorry. So don't bet your life on those guidelines. Especially when talking about marauders as it is a very powerful performance engine that needs more love then say a inline four corolla. Maybe once or twice by accident, but changing your oil at 10k miles on a normal basis seems to be pushing it. It's honestly better to just use regular oil and change it every 3-4k miles then to use "synthetic" and change it every 10k miles. That 10k mile oil would look dirtier then a septic tank. And where is the rest of the grime and dirt? Stuck in your engine.

A common mistake:For example. You have a ford crown victoria with 110k miles on the odometer that has NEVER had a transmission flush or renewal. You bring it to the dealer for service and the mechanic or service writer advise you to do a "transmission flush." BIG MISTAKE. Tranny oil is WAY to old with WAY to much gunk for a flush. The next week your transmission is goner dude. 4g's out your pocket for a new transmission. This is not a myth, it is very common, ESPECIALLY in american cars.


Tom, trying to judge an oil's condition by its colour is a guessing game at best. It's entirely possible, in fact it's very likely, you are changing out perfectly good oil way too soon.

Just because an oil turns dark does not mean it's no longer usable. Some oils turn dark fairly early and it's completely normal...Mobil 1 is one example. It's also possible for a clean-looking oil to be past its prime due to additive pack depletion.

The current rule of thumb is 5,000 miles for conventional, 7,500 for a blend, and 10,000 for a full synthetic. This is, of course, subject to the engine's condition, driving habits, and any special considerations. In some cases, such as the infamous Volkswagen 1.8T, sooner is required, and in many cases the interval can be even longer.

[Rocknthehawk]

Wow again!

I'm glad I created this thread...let it be a guideline for anyone thinking of what to do!

The truck goes into the shop tomorrow to figure out a grinding/clunk problem, so later in the week I'll do the oil change. Looks like either Mobile1 or the Motorcraft will get my money, as they're both sold at Walmart, which is 1 minute from my house. I change the oil regularly like a good boy. I just had the transmission service done at 31K (the manual says 30K).


I know it's opening a can of worms...but what filter? I've always used the Fram Tough Guard filters, but more recently I've heard not so good things. Should I just stick with the Motorcraft filter?

[RF Overlord]

guccijayda, you obviously know way more about oil and ATF than I do. I bow to your superior knowledge.

[MM03MOK]

I don't care what kind of synthetic you use, I wouldn't recommend changing it every 10k miles. "Amsoil, Purple, Mobile1" are all very good synthetic oil's and each have their own recommended guideline. Consumers are worried about prices, and manufacture recommended intervals to change your oil IS a part of that price and you will consider it when thinking of cost efficiency. Oil manufactures are in a very competitive industry and are advertising and "selling" you that product. Better to be safe then sorry. So don't bet your life on those guidelines. Especially when talking about marauders as it is a very powerful performance engine that needs more love then say a inline four corolla. Maybe once or twice by accident, but changing your oil at 10k miles on a normal basis seems to be pushing it. It's honestly better to just use regular oil and change it every 3-4k miles then to use "synthetic" and change it every 10k miles. That 10k mile oil would look dirtier then a septic tank. And where is the rest of the grime and dirt? Stuck in your engine.

A common mistake:For example. You have a ford crown victoria with 110k miles on the odometer that has NEVER had a transmission flush or renewal. You bring it to the dealer for service and the mechanic or service writer advise you to do a "transmission flush." BIG MISTAKE. Tranny oil is WAY to old with WAY to much gunk for a flush. The next week your transmission is goner dude. 4g's out your pocket for a new transmission. This is not a myth, it is very common, ESPECIALLY in american cars.
You are making some generic assumptions here. Many of us have been on this Board for 6 years and have owned the car that long. I think a few of our Senior Members know what they're talking about, some with dozens of oil changes under their belt. Many of us have spent the small change to confirm with Blackstone Labs that we're treating our cars very well, based on their analysis.

[guccijayda]

You are making some generic assumptions here. Many of us have been on this Board for 6 years and have owned the car that long. I think a few of our Senior Members know what they're talking about, some with dozens of oil changes under their belt. Many of us have spent the small change to confirm with Blackstone Labs that we're treating our cars very well, based on their analysis.

Ok? I perfectly understand where you are coming from being a member on here since 2002 with over a thousand posts. But I'm no newcomer. Marauders has brothers too u know! I've owned two panther p71's and Sold over 20 of them. One 2000 cvpi with 350k miles(mostly from taxi service, 80k from me) and another 00 crown victoria with 110k miles. I've sold many cars and particularly favor cv's as you can make a ton of profit off them just by going to auctions which is what taxi companies also do. I travel to places like Pennsylvannia, and North Carolina as they have one of the largest auctions there. Not to be rude, but I dont think you are a mechanic nor do you even work side by side with tech's. Good luck changing your oil every 10K miles with your marauder.

bottom line... If you really love your car, you wouldn't wait every 10k miles or more just to get your oil changed. :shake: Especially, Especially, if that 10k miles accumulated over years from being barely driven.

[Marauderjack]

guccijayda, you obviously know way more about oil and ATF than I do. I bow to your superior knowledge.

Such a gentleman!!!:beer::D

[MM03MOK]

I dont think you are a mechanic nor do you even work side by side with tech's. Good luck changing your oil every 10K miles with your marauder.

bottom line... If you really love your car, you wouldn't wait every 10k miles or more just to get your oil changed. :shake:Nope, not a mechanic and never said I was. Also never said I change my oil every 10K. My point is we are very well educated here on the care and nuturing of our cars. We're passionate about the car and have done our homework.

We're all entitled to our own .02 cents.

YMMV

[guccijayda]

Nope, not a mechanic and never said I was. Also never said I change my oil every 10K. My point is we are very well educated here on the care and nuturing of our cars. We're passionate about the car and have done our homework.

We're all entitled to our own .02 cents.

YMMV

Nothing wrong with that my friend! It's just that it seems you defended what the other member said which was "10k miles with synthetic." I understand clearly what you are saying and know how much marauder owners love their car! I worked at several dealer ships and I am continuing my education towards all 8 ASE certifications as we speak. I'm not an experienced mechanic whatsoever yet, but I do talk to master tech's every day side by side for the last 7-8 years starting as a lot attendant. So all I try to do is spread the knowledge that many veteran tech's have spread to me!

[Ms. Denmark]

Thanks to all for some very good information. Another reason to love this site!:)

[justbob]

You really have no clue who your talking to do ya? That Bunny bites.

But i've read enough, Oil is one subject that will NEVER be won in a debate, same goes for exhaust, tires, well everything i guess.

Don't waste your energy trying to pursuade people to your beliefs, i've wasted countless years of my own life trying the same and i can telll you this IT WON'T WORK.

The best you can do is speak it once and let others read and make up there own minds.

[guccijayda]

You really have no clue who your talking to do ya? That Bunny bites.

But i've read enough, Oil is one subject that will NEVER be won in a debate, same goes for exhaust, tires, well everything i guess.

Don't waste your energy trying to pursuade people to your beliefs, i've wasted countless years of my own life trying the same and i can telll you this IT WON'T WORK.

The best you can do is speak it once and let others read and make up there own minds.

Actually. I do, a tech moderator. Yea there are many endless debates about topics such as oil. To most marauder members, their car is their hobby. To me, cars is my hobby, my life, and my career. Hopefully, I spread enough information that some marauder members won't wait 10k miles or more to change their engine oil! I just put my .02 cents in there just as everyone else did!

[justbob]

Thats all you can do is try. I don't hardly even bother anymore.

[guccijayda]

Thats all you can do is try. I don't hardly even bother anymore.

yea well as long as someone read it, it will effect them in some way, either positively or negatively lol. :cool4: Thanks on your .02 cents though I really do appreciate your insight.

[RF Overlord]

Hopefully, I spread enough information that some marauder members won't wait 10k miles or more to change their engine oil! Enough. I did not advocate that anyone should suddenly change to synthetic and go 10,000 miles. I stated that the rule of thumb is that synthetic oil CAN go 10,000 miles under the right circumstances. This is not my opinion, but is the collective wisdom of the knowledgeable members over on BobIsTheOilGuy.

[CKMustangCobra]

Screw syn... stick with dino.

[252life]

10K or once a year on an oil change is no problem on a modern car.
And with the latest long life synthetics you can double those numbers.
Most cars also have a service indicator that signals when it's time for service based on fuel consumption and other info. Some cars also have a oil quality sensor.
It's really the filters that set the limit on service intervals nowadays not the oil.

Most manual and automatic transmissions are also "filled for life" nowadays.

But personally I change my oil when it starts to go dark, 3-4K and in the Marauder and I only use synthetic API SM 5W30

[illwood]

I know it's opening a can of worms...but what filter? I've always used the Fram Tough Guard filters, but more recently I've heard not so good things. Should I just stick with the Motorcraft filter?

I used to use the Fram filters, but I also read the horror stories about the filter breaking up and going through the oil system. For the past few years, I have stuck with Napa Gold (made by WIX) or the original Motorcraft filters (FL1A for the Mustang and FL820S for the Bronco and Marauder).

[RF Overlord]

Rocknthehawk, why would you pay $8.00 for a FRAM TG, when you can pay less than half that for a factory-recommended (and higher quality) Motorcraft?

illwood, it's not that FRAM filters are BAD per se, it's that they're a mediocre filter at a premium price. Both NAPA Gold and Motorcraft are superior filters for less money.

[Rocknthehawk]

I was going to get the Mobil1 filter, but at $16.99, I passed. Call me cheap.


I went with the mobile1 fully synthetic extended whatever, good to 15,000 miles. Not that I'll wait that long, but it was only a couple bucks more.

[Ms. Denmark]

I have been using a Motorcraft filter and Mobil 1 synthetic oil, changed out about every 7500 miles, according to my driving habits. (Mostly highway)

[tjg442]

Priority ?? "Filter" or "Oil" ?

Filter !!!!!!!!!!!!!! :rolleyes: each, and every time !!!!!!!!!!! ;)


.10 cents worth ?

[guccijayda]

10K or once a year on an oil change is no problem on a modern car.
And with the latest long life synthetics you can double those numbers.
Most cars also have a service indicator that signals when it's time for service based on fuel consumption and other info. Some cars also have a oil quality sensor.
It's really the filters that set the limit on service intervals nowadays not the oil.

Most manual and automatic transmissions are also "filled for life" nowadays.

But personally I change my oil when it starts to go dark, 3-4K and in the Marauder and I only use synthetic API SM 5W30

thats what i wanted to hear...at least you change it every 3-4k.

btw 10k miles old oil that has aged a year or more is not good IMO. 10k miles period, especially non-synthetic. you should realize the less you drive your car on a daily/weekly basis, the stricter you should be on mileage when doin an oil change. you have to put into account that the age of your oil oxidizes and weathers respective to time. thus, a rarely driven car w/ 10k miles in one year or more is worse then a daily driver with 10k regardless of driving style... realize that gunk and dirt from your oil is sitting on your precious internals for prolonged periods and will become harder to get out even with flushes.

Sure the car will last the next couple to several oil changes, but it's when your car or if your cars mileage reaches well into the 6 digits. I owned a crown victoria p71 with 350k+ miles on the odometer with three owners. First the New York state police, then a taxi agency, THEN ME(80k+ miles from me). Think about how these cars last that long. Police fleet have one of the MOST strict maintenance schedules and you bet ya they dont bs around wid oil changes. And taxi agencies is the same. Believe it or not, there are many taxi agencies with Cv's, MGM's that have 400k+ mileage on the odometer and they have scheduled oil changes around 3-5k including the fact that they drive that much within a matter of weeks.

The longest lasting synthetics can go 20k miles or more?screw it your driving a marauder for crying out loud dont test her lol. When you say 10k mile oil change once a year is no problem, do you mean it's good for the car? or it just won't kill the car? lol

[252life]

When you say 10k mile oil change once a year is no problem, do you mean it's good for the car? or it just won't kill the car? lol

Over in Europe 10k miles or 15000km / once a year, was the normal service interval for 90% of the cars here until about maybe 10 years ago.
Nowadays it's 20000 - 35000km ( 15-20K miles) These are the manufacturer recommendations using the specified high quality oils (the reason they can't push it any further is that the filters wont last)

I know it sounds strange and is difficult to get used to, but for "normal" every day cars it actually works it's not gonna kill the engine, the engine will still last longer then the entire lifespan of the car.

[Ron]

OK, First question.
Was the factory installed oil Synthetic or Conventional ?

I have a 1987 Bonneville I bought new, that has 247,000 miles on it that runs like champ. I always used Conventional oil & changed approx. 5K miles or so.
The manual recommends to change @ 7,500 miles.

I also have a 1994 S10 Blazer w/ 220,000 miles, ditto above.

So why would go Synthetic, to run it to 10,000 miles between oil changes ?

Since my MM is a weekender w/ very low miles, I've been using Conventional & changing between 3-4K miles.

My only concern is when I drive, I like to light up tires & snatch 2nd!
Maybe I should use Synthetic, just for reason ????????????

[Rocknthehawk]

I changed to synthetic because of the benefits I've read about. Longer intervals (hey, I'm lazy, and If I can got 5,000 instead of 3,000 why not?), and the added "performance" benefits.

I don't think it was clear in my post, I DON'T OWN A MARAUDER. :D

It's on my 2003 Ranger 4.0 sohc. It's a SLP Thunderbolt...basically an XLT with a body kit, emblems, and little interior things. There's a better flowing stock intake and exhaust.

[RF Overlord]

Was the factory installed oil Synthetic or Conventional ?The factory-fill oil was Conoco 5W-20 synthetic blend, which is bottled and sold as Motorcraft.
So why would go Synthetic, to run it to 10,000 miles between oil changes ?Not everyone needs to or should. Synthetic oil has multiple benefits...its pour point is lower so it flows well at extremely cold temps. It's flash point is higher so it doesn't oxidise as readily at high temps. It has a higher Viscosity index, so it requires less VII to maintain grade. If none of these things are relevant to you, then you don't need synthetic.
Maybe I should use Synthetic, just for reason ????????????See my answer above.

[BAD FIVE O]

Hey I use Royal Purple IN my MM and It drives so smooth and I also use it in my 87 Grand National and it keeps it 10 deg cooler that Mobil 1 and Castrol . Autozone Carries Royal Purple now. good luck.

[Rocknthehawk]

My local Autozone didn't have ANYTHING in the 5 quart bottles. It's much cheaper than buying 5 single quarts. The local Wal-mart DOES carry Royal Purple.

[Ron]

The factory-fill oil was Conoco 5W-20 synthetic blend, which is bottled and sold as Motorcraft.Not everyone needs to or should. Synthetic oil has multiple benefits...its pour point is lower so it flows well at extremely cold temps. It's flash point is higher so it doesn't oxidise as readily at high temps. It has a higher Viscosity index, so it requires less VII to maintain grade. If none of these things are relevant to you, then you don't need synthetic.See my answer above.


Wow! That was a great ANSWER! Seriously, that makes so much sense. Thanx.

[Ron]

Hey I use Royal Purple IN my MM and It drives so smooth and I also use it in my 87 Grand National and it keeps it 10 deg cooler that Mobil 1 and Castrol . Autozone Carries Royal Purple now. good luck.

Again, My Bonneville has 244K miles & the body & other components are failing. A serious trunk leak, both front windows fell out of track, serious Trans. leak, etc.

So, maybe if you plan to protect your engine for future exhibition in the Smithsonian Institute ?????????????

[Ron]

What is the difference between Synthetic & Synthetic Blend?

[fastblackmerc]

What is the difference between Synthetic & Synthetic Blend?

Are you serious?

Synthetic = all the oil in the can / jug is synthetic.

Semi Synthetic = a combination of dino juice and synthetic in the can / jug.

[TJCOX]

Tom, trying to judge an oil's condition by its colour is a guessing game at best. It's entirely possible, in fact it's very likely, you are changing out perfectly good oil way too soon.

Just because an oil turns dark does not mean it's no longer usable. Some oils turn dark fairly early and it's completely normal...Mobil 1 is one example. It's also possible for a clean-looking oil to be past its prime due to additive pack depletion.

The current rule of thumb is 5,000 miles for conventional, 7,500 for a blend, and 10,000 for a full synthetic. This is, of course, subject to the engine's condition, driving habits, and any special considerations. In some cases, such as the infamous Volkswagen 1.8T, sooner is required, and in many cases the interval can be even longer.

I never change it too early! When it's due, it's out of there. Thanks for the input.
I was in charge of the oil changes in the gas & steam turbines, pumps, mills, etc in our power plant for many years and had a centerfuser at my disposal, when cleaning the oil in the turbines. Great experience!
One of our gas turbines held 5 barrels (55 gal) of oil and was a V-22. (Used DA Silver)
Amazing how dirty the oil appears in a drain pan as opposed to on a dipstick.
Have a great week!

[rayjay]

Interesting read. I'm trying to formulate a oil change plan for my DTR since she is no longer a DD. Can someone explain why oil breaks down when the car is not in use? It sits in a plastic bottle on a shelf for an indefinate period in the store.

[grampaws]

The bottled oil is sealed, your engine has ports
open to the surrounding air.Air carries moisture and
over time deposits moisture in the oil and breaks
it down.

[fastblackmerc]

Interesting read. I'm trying to formulate a oil change plan for my DTR since she is no longer a DD. Can someone explain why oil breaks down when the car is not in use? It sits in a plastic bottle on a shelf for an indefinate period in the store.

Go to www.blackstone-labs.com, order collection bottles (they are free). Collect an oil sample, fill out the paperwork, send it back with payment and they will recommend an oil changes interval based on the condition of the oil and the answers you gave on the form.

[grampaws]

RF overlord is correct in that many oils do retain life even
after they turn dark and are still viable. Fastblackmerc
is also correct the best way to definitively determine
the best interval is testing the oil. Both members are
well worth listening to. This would encompass all
the variables -engine condition, driving style,type of
oil and filter used.
Many of the over priced oil filters are not worth the
money-many of the additives sold are based on
marketing not real life benefits, a good motorcraft
or equivalent filter is sufficient.

[RF Overlord]

Can someone explain why oil breaks down when the car is not in use? It doesn't.

Motor oil needs periodic changing for the following reasons (in no special order):

1) Consumption.
2) Contamination.
3) Breakdown.

Consumption to some degree is normal in all engines.

Contamination from condensation, fuel dilution, combustion byproducts (blow-by), wear metals, and, to a lesser extent, external material from a bad air filter, etc.

Breakdown caused by oxidation due to overheating, and shear, which is when viscosity index improvers deteriorate, causing the oil to drop out of grade. Both of these areas are where synthetic oils excel. Neither of these things occur when oil is just sitting in the crankcase.

[Bulten Rauder]

Hallelujah! RF Overlord has finally explained something MOST IMPORTANT!!! I don't know how many times people change oil due to "AGE"?!?!:mad2:

Man o man, I'm so happy there's SENIOR MEMEBERS here who show class and deserve respect for offering thier opinions placed here. They have that nice tone of "take it if you like" attitude. AWESOME!
I used Royal Purple in the past (yes, it's still totally fine at 10,000 miles of hard driving after analysis) but will now switch to Amsoil for excellent reasons I know of. The Amsoil filter is quite excellent at keeping my oil clean (not important?) and effective (VERY important) far beyond 18,000 miles. Yes, you can see this actually is true through oil analysis. I happen to be a diesel mechanic (for far too many years) and get analysis for next to nothing.

You may want to use Amsol, Mobil 1 or RP for 18,000 miles with the Amsoil filter (while using anaylsis if paranoid) and after 100,000 miles you can tear your motor down and it will be gleaming clean. Pull out a vernier if you need more proof.

Amen :beatnik:

[Sharky]

Enough. I did not advocate that anyone should suddenly change to synthetic and go 10,000 miles. I stated that the rule of thumb is that synthetic oil CAN go 10,000 miles under the right circumstances. This is not my opinion, but is the collective wisdom of the knowledgeable members over on BobIsTheOilGuy.

Hey, Bob is the Oil Guy is one of my favorite sites! A lot of valuable information and good advice from automotive engineers, petroleum industry engineers, and a bunch of OCD car owners who are very picky about their cars and have done a lot of research! The link has always been in my sig.

I also agree with those who recommend the services of Blackstone Laboratories. I have my oil analyzed at every oil change (probably overkill, but hey, better safe than sorry).

I use Pennzoil Platinum 5W/20 and Purolator Pure One oil and air filters.

Blackstone's comments from my first analysis, 5100 miles on the oil, 71,120 miles on the engine:


Everything looks good in the first sample from your Grand Marquis. This engine has just over 71,000 miles on it, but it looks like a spring chicken in wear. All metals read at or below universal averages, so if you wanted to run your oil longer you could, though it's obvious that your maintenance schedule is working nicely. Universal averages are based on an oil change after 4,500 miles. The oil was normal in viscosity for a 5W/20 and contained no fuel dilution or coolant. Insolubles and silicon are fine, showing good oil and air filtration. A very nice report for your 4.6L.

Blackstone's comments from my second analysis, 9900 miles on the oil, 81,052 miles on the engine:


Your Grand Marquis is batting a thousand so far regarding its engine. All of the wear metals we found in this 5W/20-grade oil read basically the same as your first sample, with a slight increase in copper thrown into the mix. The great news is that all of the wear metals read at or below universal averages for the 4.6L engine. That is a good indication of normally wearing parts. Oil filtration (see insolubles) was excellent. No gasoline, moisture or signs of coolant were present in the sample. Try 11,000 miles for your next sample. Wear should still look good!

The folks in this thread who are saying that it is perfectly safe to run synthetic oil for 10k intervals are not only correct, but their opinions are backed up by chemical engineers with years of experience and the knowledge that comes with it.

[Marauderjack]

May I suggest that each and every one of us do what makes him or her feel good about their car......"Dino Oil" every 3K miles.....Synthetic every 5K miles (for me).....RP, Amsoil, Red Line, others up to 25K miles if you feel comfortable about it and run analysis often!!!:beer:

There are no "cast in stone" rules.......only products and service intervals that satisfy each of our driving styles and change intervals that feel good "between the ears"!!!:rolleyes:

[rayjay]

May I suggest that each and every one of us do what makes him or her feel good about their car......"Dino Oil" every 3K miles.....Synthetic every 5K miles (for me).....RP, Amsoil, Red Line, others up to 25K miles if you feel comfortable about it and run analysis often!!!:beer:

There are no "cast in stone" rules.......only products and service intervals that satisfy each of our driving styles and change intervals that feel good "between the ears"!!!:rolleyes:

+1, that about says it all as the debate could go on forever and a day. I personally do 6K on synthetic with MC 820s. I believe based on the info above I will be changing my oil once a year as she is now stored Oct-Apr.

[Ron]

Just changed my Conventional oil.
It took me 2 years to accumulate 3,500 miles, I'm embarrassed, sorry.

Walmart resolved my decision. They carry 5W20 FORD MOTORCRAFT SYNTHETIC BLEND for $11.50/5qt. jug.

I checked the manual just to be sure the capacity is 6 qts.
Low & Behold the manual requires 5W20 FORD MOTORCRAFT SYNTHETIC BLEND.