Hi Alan
Some good advice as usual from Trevor, I also have a Mercedes e320 CD Avantgarde and concur with all the comments Trevor has made and exactly the case when on the Motorway change down the Gears and give it a blast through it seems to do the trick and keeps the Injectors clean which is the main problem sometimes with an erratic diesel engine not running smoothly, and a dose of Fortes Injector Cleaner helps as well
BAZZER RN 1