I buy Valvoline SynPower SAE 5W-30 in the 5 quart jugs at Advanced Auto.
http://www.bmwusa.com/Standard/Conte...ngineOils.aspx
BMW Long-life rating LL-01 Approved Synthetic Oils for the US Market:
Castrol Syntec European Formula SAE 0W-30
Mobil 1 SAE 0W-40
Pennzoil Platinum European Formula Ultra SAE 5W-30
Valvoline SynPower SAE 5W-30