Quote:
Originally Posted by MCM5
Just had my 1st service today. Dealer insisted that correct spec is 10W-60, & that's what they filled into my engine (Castrol TWS Motorsport SAE 10W-60), no matter what I said.
Not sure what i should do now ? What harm will it do to the engine if keeping it running with 10W-60?  |
Did you check the manual that came with your M5 MY? For my 2013 M5, the manual that came with it on page 177, it recommends engine oil viscosity grades SAE 0W-30 or SAE 0W-40 and alternatively SAE 5W-30 or SAE 5W-40.