The ALM Manufacturing MS002 Fuel Enhancer is designed to be used as an additive for petrol and diesel, 2-stroke, and 4-stroke engines to preserve fuel when the engine is not used for long periods or when the fuel must remain in the tank for a long period, for example over winter in a lawnmower. It helps stabilise and prolong the useful life of fuel by protecting it against oxidation and helps ease starting after long periods of no use. It also helps protect engine parts against corrosion. It's recommended uses include In fuel before starting up after a long period of no use. In fuel before starting a long period of no use. All types of petrol and diesel 2 stroke and 4 stroke engines. Marine engines (in-board or outboard). All garden machinery engines including lawnmowers, grass trimmers, hedge trimmers, leaf blowers, etc. When a tank of fuel lasts more than a month. Just mix MS002 Fuel Enhancer into the fuel, 100ml treats 5 litres of fuel.