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Originally Posted by bgsquad
ok, a different question... what if I want to top up my engine oil, but don't know what viscosity did the dealer put? can i top it up with mobil 1 5-30 regardless of what's inside? i.e what if the dealer has put 0-40 and I come and add 1 quart of 5-30, would it be ok?
Thanks...
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Yes, you are fine to mix them. Suggest you use a 5-30, as that is what BMW recommended originally. If it is a much hotter ambient where you are than in the US, a 5-40 wouldn't hurt.
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