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The following is the only recommended and approved synthetic oil for BMW M (Motorsport) vehicles in the US market with gasoline engines, at the present time.
BMW Long-life rating LL-01 Synthetic Oils for BMW M vehicles equipped with S54, S62, S65 or S85 engines:
Castrol TWS Motorsport SAE 10W-60 Synthetic Engine Oil
Castrol Formula RS SAE 10W-60 Synthetic Engine Oil (BMW part number 07 51 0 009 420)
If Castrol High Performance Synthetic Oil is not available and you need to add oil between oil changes, only use synthetic oils with the following specifications for M vehicles:
Viscosity - preferred SAE 10W-60
Alternative - SAE 10W-40, SAE 5W-50 or SAE 10W-50
Use only oils with an API rating of SJ/CF, SK/CF or higher.
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