How many miles do these plugs last under normal driving conditions? I thought I read somewhere 15K miles or so for copper plugs but I'm not positive. Thanks guys

Bryan

 

I change mine about every 5000 mi or so.It depends how the car is running.I always see a great improvement in starting,and smooth running up to the line with frequent changes.But I also replace my coil wire every 6 months or so for better performance.Maybe I need to get out more or something,but this works for me.My02

 

I just replaced my plugs and it fixed alot of my low rpm hesitation. Obviously they were needed. I cant say exactly how many miles were on them, but probably somewhere around 10k