I'm going with PEH on this one. Too many filters , spark plugs, distributer caps, and many other things are replaced needlessly, because there is a dollar to be made. When I ran my shop I never replaced these items unless they were due for replacing. I'd rather spend my client's money on preventive maintenance where it was really needed. The commercials tell you to get your car tuned up to improve fuel mileage and performance. Years ago I had a 79 Toyota that hauled ass and sipped the fuel. One day it started to die on me and was hard to start. I decided to check the plugs which was something I had not done in years. The gap was about 95 thousanths. It was time to replace the plugs. Now I'm not suggesting you run your car til it dies, but I'm saying that a good mechanic knows when it is time. Remember wax on wax off.

Peter

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