The quantity of Air used by internal combustion engine is very vast. The possibility of inducting a considerable mass of solid contaminants from the atmospheric air is very high. The air filter removes carbon, abrasive and other contaminants from air before it mixes with fuel in the engine system. If allowed to get inside the engine, such particles can damage cylinder walls, pistons and piston rings. A dirty air filter prevents the engine from breathing properly, which can decrease fuel mileage and performance and make the engine work harder than it needs to. ACDelco air filters lengthen engine life, prevent engine wear and give better fuel economy Change the air filter once a year or when recommended in your owner's manual. Let your vehicle breathe!