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If its asking for a quart you should be safe adding a quart. My E46 used to ask for a quart every few thousand miles almost on schedule. I started to keep one in the trunk at all times.
You should be OK with any of these.
BMW Long-life rating LL-01 Approved Synthetic Oils for the US Market:
* BMW High Performance SAE 5W-30 Synthetic Oil* (BMW part number 07 51 0 017 866)
* 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
Use only oils with an API rating of SM or higher.
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