Lucas Fuel Treatment is for gasoline and diesel fuel. It does not contain alcohol, solvents, kerosene, diesel fuel or anything else that would be useless or harmful to engines. Low sulphur diesel fuel and reformulated gasolines have had the polymers removed from them, not because the polymers were harmful but because they were attached to the aromatics (fumes) in the fuels. In their zest to rid our air of gasoline and diesel fumes, our government has stripped our fuel of its main lubricants and, in the process, a great deal of its power. It replaces those polymers with a concentrate that makes the fuel slicker and more powerful than it was originally. In fact, the user usually picks up more than enough fuel mileage to pay for the fuel treatment itself. Lucas Fuel Treatment lubricates rings and cylinder walls for longer life. It causes more combustion for more power and higher fuel mileage with FEWER EMISSIONS. Lucas Fuel Treatment cleans and lubricates valves, pumps, carburetors, injectors and compression rings. It is an absolute must for rotary pumps! It safely replaces the need for lead in older engines.