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There is nothing wrong with changing your mind. Happens to me also quite a bit as I try different oils and research further...but I would be interested in why Coyote feels that Castrol syntec would be better. I've found MC to be an excellent, reasonalbly priced oil, Syntec may very well be better...but in what application and for what length? In a 5 - 6000 mile oci application MC 5w20 performace is about as good as it gets. I have seen nothing in the UOA section to make me think that I am mistaken in this opinion.