I just bought a C43 with 67K from a mercedes dealer. I picked it up for 21,500. A good deal. It is starmarked, with Certified preowned warranty. However, the car had the following problems. Oil leak at valve covers. Bad MAF sensor. Bad speed sensor. Bad starter. I took it back and was kind of pissed, because the oil leak was in the back and very noticable. Due to the grime buildup, it was obvious it was going on for a while. I want them to go over the car again. They said NO. Does anyone know of any contacts for mercedes in Northern Calif, someone in a position of power who I can let know about this situation? ALSO, the back seats squeak when I go over bumps. Anybody have this problem, and if so, what can be done to fix it? I really love the car, and I want to keep it. I truly believe that this car will one day be considered a classic.