AMSOIL Performance Improver- PI, will restore and clean fuel injectors up to 100% flow. PI will also restore engine horsepower up to 14%. Taking your vehicle to the dealer to get the injectors cleaned will be expensive. By adding the recommended amount to your gas next fill up will not only clean your injectors and restore lost horsepower but will also increase your vehicles fuel mileage up to 5.7%. AMSOIL recommends adding PI every 5000 miles for clean injectors and top performance from you engine.