Hi. I'm new to the MBClubUK but thought it would be a good place to be as I'm considering a new C63 Coupe. As the thought putting all that power through two wheels had me slightly bit nervous the sales guy suggested I try a C43 Coupe. The first thing he did when we got in the car was "explain" that the C43 4Matic had a "characteristic" which made the steering noisy on full lock on cold tyres. He duly demonstrated in the car park and the front end duly "clonked" as though the wheel was catching something. He said this was a steering box issue on RHD cars but was "nothing to be concerned about". I asked if there was a technical fix coming and was told "nothing planned as the RHD market is so small". At the end of the test I tried to get the car to make the same noise and it had gone. Sales guy said it disappeared when the tyres were warm and only occurred when they were cold , also it didn't do it in reverse on hot or cold tyres.
Having read this thread and others , premature tyre wear does seam to occur on the 4Matics. For no this has put me off a C43, so I'm still considering the C63.