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) :-)
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?
Web based forums are like subscribing to 10 different newspapers
and having to visit 10 different news stands to pickup each one.
Depends on the vehicle and the plug. Dual plats every 80,000km, +/- -
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!!!!
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
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