spark plug changes

How often do most of you change your spark plugs, if at all?

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Never. I just sell it after it won't run anymore :-)
Just kidding. It would depend on the year and how many miles it has on it. My '02 Escape said to do it every 100K miles, but I did it at ~65K. But that was only because I had to take the intake off to change a rear COP. Figured I'd save myself the hassle later on :-)
My '14 Escape only has 8500 miles, so no plug change yet (100K recommended for it, too) :-)
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When I was a kid in 1965 I had a 1961 Sunbeam Alpine (my first car) and would change the plugs every 15k miles. Of course, it only took 10 minutes, so no big deal.
Despite complexity, I think modern cars are much more reliable and require much less maintenance. I wonder why that is?
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wrote:

but I remove and check at about every 40,000. Single plats on waste spark systems don't last quite as long.
I have not had good results with iridium plugs (only used them once on Chryco PT Cruiser - they misfired from about the second week - replaced with plats and right back to smooth idle, and you won't catch me using Bosch plugs on anything that isn't german - and you won't catch me owning anything German!!!!
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wrote:

For my own cars I don't like to go beyond 50K, (or less then that if called for by the maker, such as on my PT cruiser which says every 30K or so) not because the plugs won't last longer but I want to pull them out before they corrode in place as well as take a look at them to see if they all look "good". But I've bought cars with over 100K and the original plugs and the cars were running fine, my putting a new set of plugs in them made me feel better but didn't make the car run any better.
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