I have at least 60-70 hrs on the Iridium plugs and
they are performing flawlessly. I pulled them out and took a look a few
hours ago and they looked great, so I put them back in. As far as I'm
concerned, Iridiums are the only plugs I will use from here on. This
could change if I have to start burning 100LL.
Mark,
Are you using the Denso IRT 0131 plug? I
looked at those, but I can get 6 sets of the NGK B9EGV for the same amount of money, and get
some change back. I change them at about 35 - 40 hours, or a less if I burn a
couple tanks of 100LL. But I guess if the iridium will go 200 hours it would be
worth the cost.
Al G