Quote:
Originally Posted by dekaliber
FWIW, I talked to my mechanic and he said that the stock BMW transmission fluid is actually really good, the only downside being that it's expensive. He told me that he'll change out the stock fluid on cars with 100K+ miles and it'll come out cleaner than aftermarket fluids after much shorter intervals. I sent the RP back.
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I don't know any M owner who keeps fluids in past 15k, but it does make sense that the factory fill would last a long time. cleaner than any other fluid I have my doubts.