Honestly when i first got my x i changed filter and put redline in. Fluid was yellow/brown at 99k. But i drained pan and refilled with amalie(sp). Thats what i always ran in my $4000 built trans for my pullin truck and all my other autos. Imho just get a quality syn fluid.

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2001 4.4 m60 manifold, cai, weather techs and new drilled slotted rotors.

1996 f-250 900hp 2.6 pulling truck

1969 mustang mach 1 550hp 377cleveland