How long do EVO stock spark plugs last?Manual says 60K.

 

bump

 

that really depends on when/how much you have modded the car :}

 

There are to many varialbes answer your poll correctly. One variable is the type of plug you are running. If you are running Copper plugs then I suggest you change them every 2 oil changes or so. If you have better plugs like Iridiums its going to come down to your mods and your tune on the car. Way to many varialbles!!

 

i changed mine at 25,000 miles and there were no reason to do that. THey were still in goodshape. 320WHP at that time.

 

You did not read the question fully. It says stock plugs, the ones that were on your car whe you bought the car.

This question is not designed to be a valid scientific experiment. To do so you would have to do many restrictions to the experiment. Besides, one person's definition of a spent plug may not agree wtih another's. Irridium plugs do not generally have the electrode degradation that the copper ones do. In other words the physical warning signs are not there like they are with copper plugs.

The purpose of this poll was to get a general feel about when to change plugs. The manual says 60K. Some might think 10K, etc. without really needing to change the plug other than to make them feel better.

 

I use coppers, so I change them every other oil change or so.

 

My service and warranty manual calls for changing them at 30,000 so thats when I did mine but they were still good at that time. I'm sure they could have gone longer but you can get a set of NGK Iridiums on ebay for $25 a set so it wasnt a big deal.

 

Stockers last differently depending on mods you have done, and if the car is tuned or not. I personally switched over to coppers and change them at every oil change.