Soot/black dust on back of AW 335is
Does anyone else deal with this? After a relatively quick drive I get a fine black dust along the rear of the car (back bumper and back vertical surface of the trunk). Is it running rich? Do any of you other white 335is guys deal with this too?
(sorry for the distinct lack of pictures in this post, but this IS a handy thread for the quick question).
2011 E93 335IS - AW w/ Saddle Interior, DCT