Spark plugs.

Well, I just replaced some Iridium plugs with stock Denso this past weekend. I found my old maintenance sheet, and it appears that I hadn't replaced them in 75k [emoji51] . While they might look better than copper plugs would at 75k, the truck did run a little rough, so if they do last longer, I'd be curious as to the real definition of "last longer". Stock plug gapped to .040", while the old Iridium gap had eroded to .070" (yowsa!):


Note to self: don't put off replacing the plugs until the truck runs roughly! HahahaView attachment 17105

That plug is wore slap out! I bet your truck is running a lot better. Lol.
 
Curiosity has the best of me. Why does the factory do half Denso and half NGK plugs?
 
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