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Q: 2004 clk 500 with 23,000 miles on it. should i change the plugs?
on 2004 Mercedes-Benz CLK500

car is running fine
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This engine calls for the equivalent of a Champion KC11PYP spark plug which are fine for 60k miles in my opinion, many would say leave them in for longer but if it were mine I would change at 60k.
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