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I just did a tune up on my 2000 Civic LX.(251000 miles). The old plugs looked like this any idea why? They honestly couldn't have more than a couple thousand miles on them, and maybe two years old. Three years max. I've worked on cars my whole life and I never seen plugs look like this. Is there anything that caused this that I should be worried about? Never seen plugs like this why did this happen?