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Oil Question
Went to the dealer for an oil change. 2013 528i calls for 5-30w synthetic. Dealer put in 5-20w synthetic. When I asked why not the 5-30w that my manual says, she told me we don't have that. She offered to change it out for plain 5-30w!...No, I told her this cars motor was designed for synthetic only. How will the 5-20w syn. affect the motor?
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