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Old 05-10-2009, 05:39 AM
HarryM HarryM is offline
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Join Date: Jan 2001
Location: Los Angeles CA
Posts: 140
I am wondering if 100,000 miles is too soon to replace plugs in these engines. On my daughter's 2001 CLK320 I replaced them at 99,000 miles about a month ago. The plugs looked battered and pitted, but replacement made zero difference in fuel economy and zero difference in performance or driveability. They could have been left there for another 100,000 miles.

I agree with removing and reinstalling them with anti-seize about every 50,000 miles.

FWIW it took me six hours to replace them. One of the plugs took 45 minutes of loosening and tightening and lots of WD40 to come out.

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