Why is it so expensive?
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2006 Mitsubishi Endeavor Question: How often do spark plugs need replacing?
Bret Bodas from RepairPal Test Shop, March 12, 2009, 09:43Master
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.
Answer #2yourpixels January 25, 2011, 17:33Technician
try iridium plugs they are expensive but last 3 times as much