Be careful adding oil - if you overfill by even a small amount, you'll get an overfill warning...ask me how I know.
If you're a stickler, drive to a totally flat surface and recheck. If still a smidge low, add a tiny amount and recheck.
Underhood sticker for US market is 0W-30. I'd get a quart from the dealer or a Group IV synthetic 0W-30 w/BMW LL-01. Remember - you're a stickler :-)
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