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Did the dealer use the same brand/weight as the previous oil change?
I know for my old E60 M5 when switching to Liqui Moly brand, the car didn't burn oil like the Castrol oil would.
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2015 M5 CP - Alpine White - My joy ride
2013 LS 460 - Pearl White - Wife's
2007 M5 - Black Sapphire - sold
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