I was told the Pennzoil was the same as GM synchromesh. Joe Dietrich told me to run this in my 600RR.
JJ
Ran Redline D4 ATF for years following the recommendation of LAW Motorsports and never had any issue. I have switched to Motul Gear 300 75/90- D4 ATF along with Patterson I believe and also haven't had any issue that I'm aware of.
My thought is the T56 is overkill for our power levels and I don't think heat is an issue either so run a good fluid that can handle the heat. That's where I'm led to believe Motul does a good job of handling heat-I run Motul in engine, trans, and rear end.
Bryan Leinart
CMC #24
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