I own a used 2004 Mercedes C320 4Matic. I bought it with 57k miles. I drive it about 150 miles per week. The reseller told me i needed engine mount replacements at 67k. The car did have a vibration, which I was sort of ignoring, so I had the work done. Now, the vibration persists. It is most noticable in the morning upon start-up, at an idle. But it is also noticable when the car is warm and I am stopped at a light. It can also be noticed as a subtle vibration in the steering wheel at highway speed. I am very sure it is not wheel balance or rotors (hey, I can feel it at a stop).
I brought it back to the dealer, who said after 5 hours of diagnosis, they could findind nothing wrong.
Anyone else experience this?