My '98 E300 Turbo Diesel is going to be rolling 200k soon (hit 193k today). To the best of my knowledge the fuel injectors have never been touched. Could I get away with replacing the nozzles only, or should I send them off to be checked and balanced? The car runs really well and hardly smokes at all under heavy acceleration. There is slight nailing at cold idle that smooths out around 900 rpm (not revving the nuts off a cold engine I mind you). I have the car for sale but I would like to know that the potential buyer is getting a trouble free engine. This is new territory for me. I've never touched diesel injectors on any of my 5 other previously owned diesel Mercs. Any advice would be appreciated. I sifted through some old threads via search and didn't find much. It's a shame we don't have "time between overhaul" like Pratt & Whitney PT6 fuel nozzles!