This lawnmower fuel enhancer maintains your machine's efficiency, helping it run smoother for longer. It's suitable for maintaining your machine's engine. Recommended uses: With all types of petrol/diesel when starting up after a long period of no use, or when a tank of fuel lasts over a month. Can be used with all 2 stroke & 4-stroke engines, as well as marine engines (in-board or outboard) & all garden machinery engines including lawnmowers, grass trimmers, hedge trimmers, leaf blowers, etc..