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Are two different brands of oils with the same viscosity grade and API rating really the same oil?

April 26, 2017API brands different grade Oil Oils rating viscosity

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Are two different brands of oils with the same viscosity grade and API rating really the same oil?

1 Answer

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NO. Motor oil brands can differ in many respects. Base oil formulations can differ widely, any motor oil can contain up to 20% additives and since additives vary in quality from manufacturer to manufacturer motor oil is not necessarily motor oil as they say buyer beware.