In the UK, BMW recommend 0W-30 for the M6. I'm changing oil at about 8 to 9000 mile intervals, and so far have never needed to top it up at all. The electronic oil gauge indicated still at maximum just prior to the last oil change. That's if the gauge is to be believed! I've a BMW Service Pack on the car, but the last £00 invoice doesn't state what make of oil my BMW garage put in...
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