- Aug 25, 2011
- SL500 (R230)
Is it normal for the exhaust tailpiles to turn black with soot just a week after being cleaned, the rear bumper is also covered in soot just above the tailpipes. I also notice when the engine is turned off there is smoke coming out of the exhaust for a few seconds. My Audi TDI didn't turn the tailpipes black and didn't smoke either!