My front left wheel was wobbling in turns and just being sloppy in general. <p>I got under and saw that the tie rod (or track rod arm) that controls the horizontal turn of the wheel had blown bushings. I bought the whole tie rod (it comes as one unit) direct from Mercedes and it cost $40. It was easy to put on and the improvement was noticed immediately. I love these cars. You can take the whole thing apart with plyers and a screw driver if you really wanted to. They were designed to be so damn user friendly mechanically speaking and you can't stop the damn things.<p>I'm very proud of myself.