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Never tried the Tremec fluid as it's fairly new but I have run Royal Purple, Mobil1 Syn ATF (recommended by Tremec) and Redline D4. The stock fluid was borderline useless when the temps dipped into the 30's, I read a ton and Royal Purple was mentioned the most so off to Amazon. The RP was an immediate improvement and I never really thought about it again, fast forward 13K miles and the RP must have sheared out of grade because I was starting to feel gears. For fun I went with the Mobil1 ATF and it was smooth as glass in every gear but 1-2 and 2-1 it would balk. Next up Redline D4, better than the Mobil1 but still cranky in 1-2 (either direction). After a few thousand miles I put the RP back in and it is definitely the best of the above IMHO, if I have to swap it every 12K I'm OK with that. Transmission fluid is subjected to severe shear, I base my motorcycle oil changes on gear feel. I'm interested in feedback of the Tremec fluid though, 25K on the car now.
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