I installed 6 of these on my 2008 Nissan Quest after accidentally causing a misfire problem (water splashing on the spark plug area). Anyway I replaced all 6 because my code said P0300 which means random misfires. And I don't have time to guess, and I don't have any fancy spark plug testing tools. Anyway, all 6 were replaced and I've had the problem ever since (about 3 months I think). For the price I can highly recommend them. I decided not to rip them apart because a mechanic friend of mine said I didn't have to.
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