Have owned FoMoCo cars all my life.
1979 T-Bird - 200,000 miles on original FMX transmission!!
1988 Turbo Coupe
1989 Crown Victoria LX
1991 Mark VII LSC
1997 T-Bird LX
1998 Mark VIII LSC
Stick with a Motorcraft filter. Change your oil every 3,000 miles. I used Castrol when I used to change oil myself. Now the filter is so difficult to get to and get off, I let the dealer do it on the lift.
Been doing this routine for 23 years, never had a problem...
JohnnyB
2004 Mach 1 - Torch Red 5 Speed
2003 Mercury Marauder
300A, RPC Chip, 4.10's, K&N Aircharger
2002 Ford Focus ZX5