Have any of you replaced, or had replaced, your spark plugs? My son's car has over 54k miles on it, and it hasn't asked for new plugs yet. I ordered a set of Denso from Amazon.

 

The Densos are good for 60 to 80 K, its more about hours than miles.. Committing is crummy traffic wears them faster than a freeway zoom ... It wont hurt a bit to change them.. The extra little kick to the gas mileage is worth it.. YOu might also consider a bottle of techron in the tank to clean the injectors..