I guess I'm not completely sure that it's a '202' series. I got that number from the MB site. It's actually a 96 C220 with about 75k on the clock. It sounds as if the timing chain is going but it seems a bit early for this at 75k. Could there be an issue with a bad chain tensioner? I've had a good history with this vehicle and have changed the oil frequently since new. I've done the big screwdriver to the ear test on all the components in the front of the engine. And all seem fine. All pullys are tight and show no play. It just seems too early for the timing chain. Could the tensioner alone have gone bad? And would it be possible to just replace this part without doing the entire chain? Obviously I'd do the tensioner myself, but would probably take the chain job to a pro. Unless you folks can talk me into doing it myself. I've got the shop equipment and tools to do it. But am just a bit weary about digging around in there... Any ideas ?