They dont wear out often and need to be of the Quality commensurate with the engineering in that Engine…which is to say…High Quality. Replacing the plugs probably wont hurt you either…when were they last replaced? Use the OEM plug as well…almost surely some form of Bosch Platinum…or other high quality plug…Do not skimp on the type of Spark Plug. If NO codes…you need to see if you have anything in the plug well that would short the coil to ground. If you do have an engine code…it will point to the offending plug/coil combo…after that…just replace whatever one is misfiring. Id check for codes and if there are none…pull a few coils and make sure there is no oil in the plug well…or any other liquid. If one of the coils is failing…you should throw a code, but I have seen many engines NOT throw a code when one of the coils shorts to ground (usually from oil in the plug well from a leaking valve cover gasket) When they short to ground you dont get a code bec technically the coil is firing but that energy is going to ground instead of thru the plug. Car drives great and gets better gas mileage than my Lexus RX. I believe your engine has coil over plug system…which means No distributor, no spark plug wires…Just coils…over plugs. Purchased a 2006 C 230 AMG with 155,000 miles for around 3500 private party. ![]() I would replace the spark plugs and the offending coil. ![]() ![]() Sounds like one of your ignition coils is beginning to die. engine timing could be off.for the mercedes benz inline 6 cylinder ignition timing 7 - 11 degrees before top top dead center with idle set speed 650- 700 rpm.
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