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Folks, Castrol clearly has a deal with BMW; it doesn't mean it's superior. Manual clearly says 10/40 and 10/50 are suitable replacements, but Castrol 10/60 is recommended. I definitely plan to use M1 15/50 after warranty. It's not listed, but I live in TX, where temperatures rarely dip below freezing, so 15 is perfectly fine. In the north, I'd probably use M1 10/40 and monitor oil consumption, which shouldn't be a problem if car is not driven aggressively all the time.
Since I'll drive my car very lilttle, I'll force dealer to change my oil annually as manual calls for during warranty. If I was doing oil changes in-between (which I'd certainly do if driving 15K/yr), I'd stick with Castrol 10/60. Good day.
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