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not all mobil 1 oils falls under group III, one good example would be their 0w-40 European Formula which is a PAO based oil I believe, that is widely used in Mercedes and Porsche engines.
However with the M3 case I highly suspect oil specially formulated would be the since I believe engineers knows more about friction modifies, engine needs, and such are more qualified to make a suggestion. Therefore I believe the castrol 10w-60 suits my needs quite well.
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