This looks like it could be a real sticky issue. No pun intented. On page 221 of the manual it states "Only use approved BMW High Performance oil". Then it states you can use up to a quart of another oil. Then it recommends Castrol. Does that mean any Castrol oil or only BMW-Castrol oil? According to the Magnuson-Moss Warranty Act, BMW can only require you to use their oil if it is free under warranty. Since we get free oil changes I guess we are require to use only BMW oil. But does this mean that if we need a quart of oil, the parts department should be require to give it to us free?
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