Spark Plugs

When should you replace your spark plugs??? manual say 100k... but I have heard different things from different people. Just want to get your guys' input. Also what spark plugs are the best?

I wouldn't wait untill a 100K , but you probally could. I go with a/c delco platiunm or splitfire (I was suckered into buying these so I will pass it on to you), I don't know if they are any better than standard plugs, but they sure cost alot more (so they must be good...right). I heard nothing but good things about bosch platinum. Or you can pull 1 of your plugs and see if it's worn enough to require a change, I would do it any ways just for rutine maintenace. And don't stop there get wires and dist. cap depending on miles it has.

I have to disagree with Skipr. I would not use Bosch Platinums in my truck EVER. Whether they be single electrode, dual electrode or the platinum +4's. Your ignition system is not powerful enough to take advantage of the multiple electrode design so I wouldn't waste your money. If you search through the archives you will find plenty of individuals that swear at them, then swearing by them. I would only use the factory ACDelco plugs, and possibly the equivalent in NGK or Denso. I have not used Denso plugs in any of my vehicles but I do know that other foreign makes get very good use out of them. I have used NGK however when a ACDelco was not available and I'm very pleased with the quality and constuction of their product. I have used the V-power NGK's and I do notice a slight difference, but barely. I'm a die hard guy for factory engineering, and I believe that you don't need to go changing up the plugs for bogus ideas such as the splitfires. You should know that if one ground electrode is closer to the center electrode then the other, electricity always takes the path of least resistance, which is why they do not work for us. Factory engineers take into account the mixture swirling, combustion temperatures, octane and other assorted factors, and come out with the best plug that strikes a balence between fuel efficiency and power. You can't always have your cake and eat it too. Don't mean to step on anyone's toes on this one. Just my $.02 -Chris

I changed mine after 127,000 miles on my '98. All but one still looked okay. When I changed them I stayed with the OEM plugs and they are not cheap either.

My truck is about to turn 100K (not engine, its got 55K lol) sometime in the next 2 weeks, so I've decided to change every fluid, filter, and whatever else needs changing...figured it might last another 100K that way..