Bought my 1997 Mercedes-Benz E-Class with a Certified Pre-Owned Starmark warranty. After three weeks it would "miss" or hesitate at 45 - 55 MPH. My dealer said that the fuel return hoses clogged. They would not fix this problem under warranty and said it was not part of the Starmark pre-sale inspection. I had it fixed by my independent mechanic at cost of $800. the entire mainfold was fouled with carbon buildup at only 45,000 miles. My mechanic says that this is a common problem on this non-turbo engine. It's a poor design, in his words. The glow plugs were "frozen" in place by this carbon build up. I have corresponded with my selling dealer and Mercedes-Benz USA, both wished me a happy holidays. This is my sixth and last Benz.