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Mobil 1 0w40. Made for high heat German cars, and lab tests on BITOG.com show low wear metals on nearly any engine. Mobil doesn't claim the BMW spec anymore. I like 10k mile oil changes, and can get Mobil 1 0w40 for dirt cheap every where.
My car is the N20 in a X1 s28i. I see they have a BMW Longlife-14+ spec for 0w20 to improve mpg 3%.
I consider 0w40 the thinnest oil that I'll run, and holds its film strength under stress.
Some other oils that are listed as 5w30 are actually approx thickness cold or hot.
Last edited by 0w40X1; 09-23-2016 at 10:07 AM..
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