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Only use Toyota T-IV ATF?

I've changed the transmission fluid to Mobil 1 synthetic ATF since it's a pretty good fluid. It doesn't shift smoothly anymore. After doing more research I noticed that Toyota's own ATF is recommended. I'm going to change it out but to what? This is for a 93 Lexus GS300 with 75k miles. It says to use T-II but they only have T-IV now. Is using this better than using Amsoil ATF?

Thanks

Reply to
Bob
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This is from memory, but as I recall T-IV replaced T-II.

Reply to
GRL

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