Some parts of your car wear out or become dirty with use and may need to be changed periodically. Spark plugs and various filters are among the most common items that may need replacing. Many mechanics suggest replacing the spark plugs at least once a year, but on newer models the plugs should last a lot longer. Your car’s owner’s manual should have information on how often the spark plugs in your vehicle should be replaced. The air filter in your car should also be replaced at least once a year if you live in a dusty area or once every three years under normal driving conditions. Another filter that may need periodic replacement is the fuel filter. In most cases the fuel filter will need to be replaced by a qualified mechanic. For more information on spark plugs and filters, contact an auto mechanic or a nearby auto parts store.