If you go to myg37.com you will find a huge thread based just on oil. It is mostly people that have sent there oil samples to the lab. BTW Mobil 1 is by far the worst and Penzoil has the best test results. As far as Royal Purple I wouldnt think you would have a problem as long as ur running there standard weight oils and not their race oils. Race oils being 0w-X that give zero resistance on rotating parts for horsepower reasons.
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