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what oil is used?
coming from the world of subaru where everyone has their own preferences for what oil to use and what interval to change oil - german castrol (if you can find it), Motul, etc are popular - but not sure this applies to the world of M and specifically the M2. So does the customer choose what oil to bring in when changing oil or is that a tightly regulated choice that BMW makes for us? And if you track and want to change it more frequently can you use whatever you want?
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