How long do Autolite copper plugs usually last? I heard that they don't last as long as the stock plugs.

If you can get at least 50k miles out of them for a decent price, sounds ok to me. Figure thats three years of driving or so

I change my autolites every 6 months (103'*), they will loose their gap long before 50k.

But for the average driver...

slightly off topic but are the autolite 102'* comparable to the NGK TR55'*? being one heat range colder than stock? Sorry i am having trouble finding the TR55'*...


-justin

If there is such a thing as 102 they are way to cold for your car.

Autolite goes in reverse for coolness.

605 - 1step
104 - 2step
103 - 3step

Do they really last 6 months?

I change mine about every 3. At 8 bucks for 6 and 15 min of labor i'm ok with it. If your modding your car, you should check the plugs once a month or so to make sure they are wearing ok and have the proper color. If your not modding your car, you dont need cooler plugs anyway.

I'm just doing research for the future.

so the autolite 605 is comparable to the NGK TR55'*?


-justin