My 2000 ML320 (with Starmark) was in for a "B" service today (54,000 miles). I asked the SA if the upgraded fuel filter assembly was covered by the warranty. She promptly said no and said that it will cost me $365 to have a replacement fuel filter installed. I don't have any problem paying for a replacement fuel filter plus installation costs at my present mileage, but why should I have to pay for MB's upgrade (Lines, etc). The total cost for the procedure was actually $402. The actual cost of the filter itself was only $95. Plus there was 2 hours of labor. There must have been some problem that prompted them to redesign the filter. Has anyone else experienced this situation? Should I pursue this further regarding warranty reimbursement?