Changing your own spark plugs is a rite of passage among gearheads. It shows you’re fully aware that your car needs basic maintenance to stay in tip-top shape, and that you’re ready to tackle it ...

Q. My 2018 Subaru Forester is due for a sparkplug change at 60,000miles and I am a bit overdue. The estimated replacement cost is $650. The car runs extremely well, and I am very happy with the ...