I ordered a set of these plugs for my 2000 Jeep Wrangler 4.0 to replace the same ones I upgraded 30,000 miles ago. Well I pulled one with 30,000 miles and there was no wear, it looked like a slightly dirty new one. Not even dirty enough to be cleaned with a brush. I put the old ones back in and check again after 30,000 to see if they still need to be changed. No spark plugs actually do all the voodoo and mumbo-jumbo that they claim is an enhanced MPG. I think these bad guys will easily do 100,000 miles.
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