Quote:
Originally Posted by MarcoZandrini
Make sure whatever oil you buy has the American Petroleum Institute (API) rating of "SN." "S" stands for "spark" aka gas engines. The "N" means the oil is designed for engines with a turbo. The turbo lubricated and cooled by the oil.
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There are quite a few conventional oils that meet the SN spec and a few that meet the SN Plus spec (such as Castrol GTX high mileage), basically SN is not adequate as the only spec for current BMW engines. The oil needs to be a full synthetic and it is advisable to meet the appropriate BMW spec, too.