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While I do not know if their is any collusion between BMW and Chevron, I know that for my M5, BMW recommends Chevron Premium. I have tried other brands (in Sacramento area), to test the recommendations and save some money, but I can tell when something other than Chevron Premium is used in the car.
Nothing particularly scientific to my conclusions and there is always a chance that I am over sensitive to engine sounds when not using Chevron...
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