Permanent bolt on fuel enhancer ....... Extended operating life of the engine ...... Reduce the development of carbon deposits ...... Improve fuel economy ...... Enhances fuel quality by boosting the octane in gasoline ...... Allows the use of lower octane fuel ...... Increases the cetane and lubricity in diesel fuel ....... Delivers added horsepower and torque ....... Reduce emissions often by 50 % ....... Reduces number of annual oil and filter changes ....... Keeps injectors, jets and spark plugs cleaner ....... Completely maintenance free - install it and forget it ....... Easily installs in your fuel line like a fuel filter ........ Will continue performing for 400,000 Km or 5 years (5000 operating hrs) or 10,000 hrs for FHD Heavy Duty Fitch units!!!!!!!!!