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My advice is use the oil the factory recommends. Since I have my M2 serviced at the local BMW dealer it uses the BMW labeled long life 0w-30 oil.
Think this oil is a relabeled Castrol oil but don't quote me...Even so this is *NOT* a recommendation to use Castrol oil in your car's engine.
I like to point out the only authority on the oil to use your car's engine is the factory. The factory has already done the heavy lifting regarding oil. Why use your car's engine as a test bed to try to find a suitable alternative?
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