Hi diesel 1,
You need to drive that car like you stole it.Mercedes cars were not designed to be pampered,they were made to be driven.I have a 190 2.6 and I drove the hell out of it on a 300 mile trip and she never missed a beat. Just find a highway that you can run at least 70mph for about two hrs non stop and that shoud clear out all the cobwebs out of the car.