Hello my name is Phillip, I drive a 2007 Mercedes clk550 120,000 miles only running resonators w/o rear catalytic converter. My motor continues to fowl out only spark plug in cylinder#6 immediately after new plug install. When I take plug out it's covered in oil and gas and on 2 occasions the electrode was smashed all the way down in to the plug.. someone told me crank case positioning sensor but apon further research does not sound like that is going to be my fix.. my car cranks right up and sounds good and strong still just cylinder 6 continues to be a problem. Please help, I miss driving my car.. thanks

 

Have you had it professionally diagnosed?