I emailed Tremec directly and they stated that each automaker has a "favorite" fluid. They stated that they tested Synchromesh and Texaco Dexron ATF (non-synthetic) and both worked well. They had no comment on any other fluids (I'm using Redline D4 ATF).
From a warranty standpoint, I believe it boils down to what is written in the manual: Mercon spec'd ATF is required (lots of choices available) [Update: checked the manual, it states Mobil 1 Synthetic. I'm checking with the dealer regarding approved oils]. Redline D4 ATF meets Mercon V specs. Some people have reported better results with Synchromesh and Valvoline synthetic (most likely Mercon spec'd as well). If the dealer states a new TSB requires a different Mercon V spec'd oil, I'll let them install it.
<font size=-1>[ This Message was edited by: DrivingSimulators on 2002-03-13 01:17 ]</font>
From a warranty standpoint, I believe it boils down to what is written in the manual: Mercon spec'd ATF is required (lots of choices available) [Update: checked the manual, it states Mobil 1 Synthetic. I'm checking with the dealer regarding approved oils]. Redline D4 ATF meets Mercon V specs. Some people have reported better results with Synchromesh and Valvoline synthetic (most likely Mercon spec'd as well). If the dealer states a new TSB requires a different Mercon V spec'd oil, I'll let them install it.
<font size=-1>[ This Message was edited by: DrivingSimulators on 2002-03-13 01:17 ]</font>
