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Besides age, many other things can cause your spark plugs to wear out.
They're subjected to a number of forces inside the engine, including heat, gasoline and oil that can reduce their effectiveness.
High performance engines and engines that rev to high RPMs also tend to wear out quicker.
For all of these reasons, it's important to replace your spark plugs from time to time.
Fortunately, high-quality spark plugs should last tens of thousands of miles, so replacing them is not something you'll have to do often.