How often do spark plugs need replacing? on 2006 Mitsubishi Endeavor

Why is it so expensive?

2 answers
Mitsubishi recommends replacing the spark plugs every 30,000 miles. The reason the expense is so high on your vehicle is due to the labor cost. It takes over 2 hours to replace the spark plugs on your Endeavor.
try iridium plugs they are expensive but last 3 times as much