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From what I can find "iridium" means platinum with about 10% iridium as alloy. I doubt the plugs are causing a problem but they do not look good in my limited experience. I have pulled 2 sets of 8 after 100,000 miles and I could almost have mixed the old ones with the new ones I put in. One set was made in 1998 ( GMC truck ), one set was made in ...

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