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Originally Posted by skabone69
Iridiums do not last as long as they claim. I just changed out my Iridiums I had in my car for 60,000 miles and they were garbage. I've learned my lesson and will just stick with stock copper plugs, and change them every 30,000. I was under the impression that the densos were supposed to last 100,000 miles but I'm glad I didn't put them to the test. stick with stock plugs.(I'll post up some pics later of what they look like after 60,000 miles of abuse.)
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there are two types of iridiums according to NGK. one type they use as oem in some cars like the STi and on newer honda motors and the other they sell as a performance plug. the oem style one is designed for longevity while the other has a smaller tip designed for performance 6mm i believe. the ones denso makes have a 4mm tip which why they don't last long. i'm not sure if denso makes an oem type idirium plug like ngk does.