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Originally Posted by therealm3
Look, I don’t think people are disputing that the owners manual says to use M1 5-30. Just that it may be a typo as the 5-30 in Europe is different oil, and that may be where it came from. Mobil in the US only lists 0-40 as applicable for a modern BMW, so that is what I use. You are free to use what ever oil you want. It’s your car.
I agree with your reasoning for oil choice, but am curious about your statement of less wear. Is that based on the fact that a thinner oil will get up into the head and cyl. faster on start up? If so, wouldn't the 0-40 do a better job as it has a lower cold viscosity?
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the other mobil1 oil mentioned in the manual is 5w-40, which is not even available in the US, which further leads me to believe there is misinformation in the manual.
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Originally Posted by brummelenj
From BMW: Castrol 5W30 TXT (LL01)
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correct, but the US does not get this version. the only castrol oil sold in the US that is LL-01 approved is castrol syntec 0w30, which is also known as german castrol (or GC for short) since it's made in germany.