I change mine every 6 months (every other oil change). They're cheap and it only take a few minutes to do and keeps things in running order.

 

Kinda a waste of money don't you think? Plugs should last a MINIMUM of 20000 km or 12000 miles. And that's if you're using cheap-o crap plugs.

 

When they get fried for some reason then fix what caused it....

 

i run on ngk ix iridiums, probabably on my 4th set..i seafoam it every summer or winter and seafoam saturates the plug and "bricks" em.



and the plugs are tightened with a mild dab of anti seize and torqued to 13 inch lbs.

 

Yeah, every service or every other service. They're cheap as hell, so why not.

 

I used to change them on the Tib every 6 months also. It was like $16 for a set of NGK's.

 

when i worked at nissan and could get a set for $5.50 with tax i changed em every oil change



takes 10 minutes

 

I find mine are soiled by year end so its an annual event in the tib.

The Accent just hit 50k and finally got plugs as part of her 50k service.