When to change timing belt? - 2008 Mercedes-Benz E350 Sep 29, 2015you don't have to change the timing belt,because it DON'T have one!ALL mercedes have TIMING CHAINS!do you have an owners manual? 2008 Mercedes-Benz E350 / When to change timing belt? When to change timing belt? (2008 Mercedes-Benz E350) At what mileage should 2008 E350 timing belt be changed? Efun in Milwaukee, WI on . High Quality Mercedes Benz E350 Timing Belt at Partstrain As the car's rhythm, the Mercedes Benz E350 timing belt Mercedes Benz E350s your auto components in harmony with other parts. Using very accurate teeth that fit with mating sprockets, the timing belt in your automobile is the part responsible for the harmony of your camshaft, crankshaft, valves , and pistons.