Iridium in general:
Don't remember what brand I put in my Kia but they are iridium and have
no perceptible wear at 70k miles. Never have to gap but I do remove them
every 10k miles or so to make sure they don't freeze in the head.
Most iridiums can go 100K+ as long as the engine isn't an oil burner or
BUT be sure that the vehicle can use them before you spend the money.
The Jeep 3.7/4.7 engines for example can start misfiring if you install
most of the high mileage plugs. About the only ones that work well are
the NGK ones because they have a copper core all the way through and
only the tip is iridium. Many of the others use steel or copper flashed
steel for the core. Those have burnt up coils and created problems in
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