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I have been using Synethic tranny fluid for over 2 years and I have ZERO issues with Mobil 1. I have tried AMSOIL and Royal Purple, eve Quaker State. Honda says use their ATF but if you want to go with a Synethic, go with Mobil 1.
AMS OIL is the only oil that stated they meet and exceed Honda ATF specs.
That is straight from AMS themselves. Royal Purple would not even say if their fluid would work or not.