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I'm 99% sure that you don't have to use Z1 to uphold the warranty, Magnuson-Moss act? Perhaps someone more legally inclined could speak in on that. Personally I feel like Amsoil's ATF performs better than Honda Z1 in my Acura. Unlike my engine, I can feel a difference between brands in my transmission.
Besides, extended warranties aren't governed by the Magnusson-Moss Act. Now whether or not the factory warranty extension is considered an extended warranty, I don't know.