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    New to the game...OW40 Amsoil vs Castrol

    Evening folks, I've been trying to understand this crazy world of oils here. I've been a fan of amsoil for quite some time - UOA on my previous G37 always turned out great, at least...in the the eyes of an amateur. Despite, would love to utilize amsoil again on my '18 BMW 440i, and upon doing...
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