trans fluid for NA 91 2.2 CONFUSION [Archive] - Toyota MR2 Message Board

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I found a thread on this and it was in conflict with my owners manual. My manual for the 5sfe says Dexron II which is GM automatic trans fluid but many posts suggest heavy weights like 75-90 or 80-90 gear oil. This seems very thick compared to Dexron II or equivalent? Someone suggested Pennsoil Synchromesh or something like that. Royal Purple was mentioned but my main confusion is around weight? can someone clarify this. Thanks