How many miles on 1 set of spark plugs?
 

Just wondering how many miles I should put on one set of spark plugs?
Currently, I'm running OEM 4 electrode copper plugs ($15 each at the dealer).
I've already put 78,000 miles on it without any effect on performance. Dealer said it will last upto 100K miles.
Appreciate any experience that you may have.

K.

I change my plugs every 10k-15k mi, or once a year.

yeah, they can last 100k miles, but they think tranny fluid lasts that long too. . .

+1 for Dudesky.

I change mine every 15K or two years.

And celsdogg, they also say to change the engine oil every 7500 miles, but I think we all know not to do that. I actually change my engine oil every 2500 miles (4-5 months), since my car sits a lot.

Also, $15 per plug is really high. Just go to AutoZone or whatever you have in your area. They have Bosch +4 Iridiums for like $8 a plug. I just run the original one electrode plug, never had any problems with that.

i change my oil every 3k, tranny and diff fluid every 30k and coolant every year or so. and spark plugs every 20k or so.