F2020 Fuel Saver does not cause either short or long term as it does not cause harm to all types of engines. F2020 Fuel Saver is a pure hydrocarbon. The active ingredient, a long chain of hydrocarbon burns into a fuel and leaves no residue. The compounded ingredients in F2020 Fuel Saver additive has been used in gasoline, diesel and bunker-c fuel in a shorter molecular form. Its also gives easier start up, reduce corrosion, increase the efficiency of combustion / burning process, piston ring more flexible and runs smoother cause reduce friction and extend shelf life of piston. It reduces the consumption of engine oil, increase engine power, reduce black smoke and reduce knocking between valves in the combustion chamber.