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Shoot, for the reasons some mention above 1. (hot weather) AND 2. It is listed as an acceptable oil viscosity by BMW 3. Is the brand I happily and successfully run in my four other cars, boat, and Harley 4. I plan on doing interim changes-not necessitated by the BMW service schedule...it is Mobil 1 0W-40 European Formula for all but the first 5-600 miles of my M5's life...FWIW...
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