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      02-20-2011, 07:32 PM   #6
ceb
NHTSA Nazi
 
Drives: 335ix
Join Date: Aug 2009
Location: MD

Posts: 1,979
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Quote:
Originally Posted by bballfreak View Post
I warned my service advisor that I will check the color of the engine oil after they claim it was changed. I take a white towel, and check the color.
If it looks anywhere near black, I refuse to accept. Same thing I do is with the brake fluid flush.
I do know that oil turns black after the car is driven a bit after oil and filter change. But I check it before I leave the dealership.
I found that once the oil looked black and may be they never changed it
or was partially changed. They changed the oil and looked a lot better.
I bring white paper towels.
I am a Chemical Engr. worked for ExxonMobil.
So, how do you check the oil quality on a modern BMW?

Guys, please let bballfreak answer since he's the chemical engineer who used to work for Exxon.
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