Originally Posted By: Spector
Obviously your plugs are easy to get to.
In the last 10 years I have yet to have a plug die before 60,000 and like the OCI for many folks these days, changing oil every 3000 miles or plugs every year or less then 60,000 is a waste of resources.
Yes, plugs take almost the same time as an oil change - Ive never had plugs on any of my cars that were this easy to replace.
Since my car manufacturer recomends SP replacement every 30K and oil every 3K (severe service), I cant agree with either of your assessments.
I am very diligent in tracking my MPGs and I can say witout a doubt that my MPGs drop (every so slightly) after my plugs have been in for 1 year. As soon as I replace, MPGs go back up.
Gas is also a resource, and increasing MPG by one helps save resources as well. Since plugs cost less than $2, I cant see the amount of "waste" being very much.