I want to agree with the poster of a bit ago who laments the fact that it's difficult to get your problems fixed when they occur.
I have a '97 W210 car which has had the head gasket problem repaired 3 times! I had to point out to the dealer tech that he should not use re-use the headbolts! I recently had no cooling and was told that the car needed its AC system re-charged but no leak could be found. Three weeks later, there was no cooling again but this time the EC light did not come on so i thought it was probably comething different. Again the dealer recharged the system saying that I had an evaporator leak and that would be $3900 to repair. I said no and opted for the opinion of an independent. No leak found and car has cooled fine all summer. I had some front end vibration problems and irregular wear on tires. After research on this site, I thought it might be the front lower control arm bushing problem. Took to both local dealers and asked to have these checked. Both said nothing wrong with bushings but one said I needed new ball joints. Problem was not fixed by replacing these so I went back, insisted that they put it on the lift and let me watch while they pried with a big bar - the bushings were mush! The only satisfaction I got out of that is that the dealer tech broke their $1300 press tool while trying to replace the bushings and they ended up giving me entire new control arm assemblies. I love the car. It looks and feels brand new after 6 plus years. But my wife thinks I'm crazy to think about another Benz.