I call BullShit on this. Mobile 1 is a Fully Syntetic oil. Now as for the best oil I use Amisol for my auto trans and rear end grease. I use Mobile 1 truck&suv for my Xterra, Mobile 1 10-30 BMW and my Jetta. I think this is nothing but a internet rummor. Please prove me wrong if my statment is Bull. I want the Facts though.