Briggs & Stratton Fuel Fit is recommended for use with two and four stroke engines and is ideal for seasonally used equipment.It is for keeping fuel fresh and protects engines more than ever before, even during long periods of storage. Not only does Fuel Fit keep the carburetor clean for easy starting, it now also protects against the corrosive effects of ethanol and maintains fuel stability for up to three years! 250ml bottle of Fuel Fit will treat up to 25 litres of unleaded fuel. Suitable for use with E10 petrol E10 Fuel should be consumed within 30 days where possible for small engine performance