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Simplest to just use BMW brand if all you need is to top off, or still under warranty (but I think theirs is all 30-weight). In Cali you won't notice diff between 0 vs 5 weight, but once off warranty use the highest top-visc you can (40 if recommended). Our engines really do need the extra stuff found in premium turbo oil (low volatility, low ash/deposits), not just the lubrication, so make sure whatever you use has good certs. There are other threads with specific info about which major aftermarket brands are OK - IIRC Castrol, Mobil1, Penzoil are all good, but run a search to be sure (I think Castrol is now the factory supplier?). And I avoid 'big box' store bargains b/c I'm afraid that they get suppliers to cheap out on things - just my own paranoia, but they certainly do it with electronics and clothes.
I wonder if they just stopped putting this in the owners manuals - my M2 doesn't list a/t this specific, but I think there is a sticker either on hood or core support. My '16 228 manual lists this: (for N20, so not specifically for B46)
Engine oil types to add
Hints
No oil additives
When selecting an engine oil, ensure that
the engine oil belongs to one of the viscosity
grades SAE 0W-40, SAE 0W-30, SAE 5W-40,
and SAE 5W-30 or malfunctions or engine
damage may occur.
You can add engine oils that meet the follow‐
ing oil rating standards:
Gasoline engine
BMW Longlife-01.
BMW Longlife-01 FE.
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