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I don't have my car yet, but I dug into it last night. BMW recommends 0W40, and if I recall, the M50i holds 11 quarts of oil. Now, that doesn't necessarily mean it will take all 11 quarts, there are many variables.
Personally, I use Royal Purple after personally seeing it's advantages on the racetrack. I trust it. Just my opinion though.
I just ordered a case (12 quarts) of Royal Purple 0W40 on Amazon, as well as a Mann filter... as I have every intention of doing the first oil change around 1500 miles.
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