I will be changing the fluid in my dad's 2002 PSD auto 4x4 CC dually soon, and he is asking about synthetic transmission fluid. We have always used dino Dexron III/Mercon because the owner's manual states to only use that fluid and NOT MERCON V OR DUAL RATED FLUIDS. I have also heard of people trashing the clutches in the tranny from using Mercon V. Now, my question is: Is it OK to use Amsoil Universal ATF or Mobil 1 Synthetic ATF even though they are both dual rated Mercon/Mercon V fluids? Has anyone been running either of these in a stock tranny for an extended period of time? Thanks guys!

 

Here ya go.
http://www.amsoil.com/faqs/faq4.aspx

Heath

 

Thanks Heath. I figured if Amsoil said theirs was OK then it must be. I guess one bad apple can spoil the bunch.

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Anybody weigh in on the Mobil 1? Heath, do you happen to know what brand caused the problems?

 

I don't. sorry