Just traded my 10 year old C280 Sport for an E550. The C280 had 100 K miles on it and I never once took it to a dealer for service. I did most minimal service myself. Car never ever let me down, It was the best of about 30 cars I have owned. As far as I am concerned, don't trouble unless trouble trouble troubles you. The C280 was perfect and in the few miles I have driven my E550, it seems to be well done. BTY, I'm the only driver and never trust a dealer to service my cars. What say you?