Bought it used Certified from Benz dealer with 17K on it. Checked oil and it was black. Dealer produced paperwork showing oil was changed 100 miles before we bought it. I thought-It's a Diesel and my first one so maybe that is par for the course. Also,I learned that oil is extracted from the top of the motor and not underneath the car which may leave some oil in the motor resulting in the black lube after only 100 miles. They charged for Adblue fill-up at the same time. A few hundred miles later it ran out of Adblue (supposed to last 10K miles)-they charged $200 for this and did not put a drop in the tank! I'm thinking that the oil change may not have been done even though it was a $400 service charge.It will cost me $120 even if I do the oil change myself. Need to rig up some sort of extractor pump-sheesh! Don't want the expense or hassle if not necessary.
Does diesel oil go black after only 100 miles?
Does diesel oil go black after only 100 miles?