I would recommend either staying with amsoil 0-W30 or going with Mobil 1 0-W40. I have the Mobil 1 and i feel the car is much smoother than the BMW oil with 10k miles on it. I know stupid to wait so long but whatever. It's been fine with the cold weather here in Boston.
Both are great oils. You might save some $$ going with mobil 1.
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