I know what you are going through I have had my car in over ten times since June 2000. I have been with Infiniti since 1990 and hardly ever in for service.I now have my first Benz 99 CLK 430. I love the car but I have been in for warranty work way too many times for a car in this price range. The dealer has always been courteous and seem to try their best to get the job done. I always tip the service rep and that gets me a little better service. There is no excuse for that many trips to the dealer. I have contacted MB Customer Service and put them on notice!