My mother is looking a 2003 CLK 430. I looked at it and drove it today, so I could give my input/opinion on the car, and noticed something that gave me pause about the car. When accelerating from a dead stop I noticed that there was some hesitation. The seller mention that he been using regular fuel in it, I believe the car is suppose to use premium. So I'm speculating that the when a load was placed on the engine, the ECU may have pulled some timing, which may have caused the hesitation. Also the car seemed to be slightly down on power compared to what I was expected, not a huge amount, but I was sort or expecting a 275 HP car to pull a bit harder under WOT. The seller didn't know when the last time the car had a major service (spark plugs, filters, etc.) so that may have been part of it as well. The car has 105k miles on the clock. Steering and suspension seem as tight as a drum, body is flawless, paint is very good, everything works, seats only have minor wear, etc. Overall I'd say the car is in very good shape for its age. It's been checked out by a MB shop and given a clean bill of health, but the hesitation has me concerned. I'd appreciate anyone's input on the matter, thanks in advance.