Spark Plugs Replace or Clean and Re-gap?
Your spark plugs will not need to be changed at every tune up, however they should be inspected and replaced if necessary. Most of the time you can clean up your spark plugs, check the gaps and reset if needed and get more mileage from your plugs. Some mechanics will replace the spark plugs at each tune up, but that is really a waste of both money and resources. “Experts” recommend that you replace your spark plugs every 12,000 miles.
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When you take out your spark plugs be sure to arrange them in a way so that you know exactly which cylinder they came from. The condition of each spark plug when it is first removed from the cylinder head will give you insight into the internal conditions of your engine. For example, if all your plugs are relatively clean except for one that is burned or covered with oil or build up you know you have a problem in that particular cylinder.