Lucas Fuel Treatment with Injector Cleaners is for gas , diesel fuel and LPG vehicles. It cleans and lubricates valves, pumps, carburetors, injectors and compression rings. It safely replaces the need for lead in older engines and is a must for rotary pumps. Lucas Fuel Treatment makes fuel slicker and more powerful and will increase fuel mileage. It also lubricates rings and cylinder walls for longer life. It causes more combustion for more power and higher fuel mileage with fewer emissions.