Quote:
Originally Posted by fazman
Still seems like a waste of money... Wait to get a misfire code under 45k miles and then troubleshoot by changing the plugs 
Kinda like changing the car battery every 5 years just because u don't want to deal with a jump start/push start and random luck in battery life of 6 yrs to 8 yrs life span??? |
It's money well spent. By the time you start misfiring, you're plugs have most likely been running weak and the combustion has been less than ideal for a couple thousand miles. Changing spark plugs is a simple cheap way to keep your engine running in top form. Don't wait until it starts misfiring. Preventative medicine. And it's much cheaper than changing your battery. I don't change the battery unless it has a problem.