Quote:
Originally Posted by 2016 4Runner SR5
You're right, Toyota oil is made by Mobil. It is however made to a specification that is not available from any other oil on the market. Yes any oil will work but will it word as well as the Toyota formulation? Will the engine run as smooth and quite on those oils? In my experience with M1 and Valvoline, the answer is no.
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It's off the shelf oil and there is no proof it is Mobil One. The specification is the viscosity. It's like when BMW and other brand recommend Mobil One. It isn't because it is specifically formulated for their engines, it's because they sent the auto maker a fat check.