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I have a 2011 C350 at (107k miles) and just recently changed my spark plugs yesterday back to Bosch (~17k miles on the set) from the ngks I didn’t know my dad out in when we did a lot of pm at 90k. and noticed a couple had pretty dark color on the threads even though the porcelain and electrodes were dry as a bone. I know this m272 engine doesn’t have valve cover gaskets and the crankcase/cam plugs shouldn’t affect these. Is there any seals I should be looking for? Or is this just normal wear? Thanks for any and all advice!
Your oil control rings are getting dirty. I’ve had that on two M54’s and a M272. Both went away after flushing with a cleaner (I used Liqui moly proline flush) and driving a few thousand miles. Nothing to worry about.
Your oil control rings are getting dirty. I’ve had that on two M54’s and a M272. Both went away after flushing with a cleaner (I used Liqui moly proline flush) and driving a few thousand miles. Nothing to worry about.
I did the engine flush at 100k miles which was around 10k after the plugs pictured were out in, but noticed they weren’t as responsive lately and that’s why I changed them
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