I can probably make this more confusing by adding my 2 cents. When I put my Tremec 5 speed in the car it had a note in large red letters that stated if I didn't use Amsoil Automatic Transmission Fluid my warranty would be voided.
I didn't understand why, so called their tech number. They said that newer transmissions with sychro's need additional lubrication that auto fluid gives. With older tranny's without synchro's the 75W-90W is what to use.
I would listen to NEWUSER1 in almost every case since with his engineering mind he will dig all the facts out. In my case, just stuff falls out.
Larry
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