Signs of worn injectors may include excessive smoke, rough idle or a light "miss", low power and poor fuel economy. Dodge 6.7L owners can extend the life of their injectors by using Stanadyne Performance Formula with every tank of fuel. Clean fuel is very important, so changing your fuel filters at the recommended intervals is important. Adding an aftermarket fuel filter or a FASS or AirDog system will also extend the life of your injectors. All of our remanufactured 6.7L Common Rail Injectors include a limited 1-year warranty.