Fuel stabiliser to prevent regular and alcohol-blended fuel from breaking down and oxidizing. Keeps fuel fresh for up to a year. Prevent fuel system corrosion. Prevent gum and varnish from forming in the fuel and settling in fuel lines and tanks, carburettors and injectors. Keeps injectors and carburettors lubricated. Full instructions are on the bottle which is 12 fl.oz (355ml) and treats 227 litres.