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Funny you should ask. I just pulled out one of my Iridium plugs yesterday to look at how it is burning. They have a little over 40k miles on them. They were still in perfect shape and still in the same gap setting. If I would have put in regular plugs I would be replacing them every 15k miles. For me thats 4 sets almost. So they have paid for themselves already in my opinion.
 

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I wont be changing my Iridium plugs at 40K. They will go till 100K more than likely. How many stock plugs will you have had to replace per the manual by then? I still think I will come out ahead. Especially when you consider what your times worth.
 
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