Aspen 2 is an engineered alkylate fuel sold premixed with fully synthetic biodegradable oil. Aspen 2 ft. s cleaner formula significantly reduces carbon build-up and deposits in the engine, making your equipment operate more smoothly and more efficiently. Your engine will be easier to start, and the fuel has a far longer shelf life than that of standard fuels. Aspen 2 is suitable for engines requiring 50 - 1 or 40 - 1 mixes. Aspen 2 can be used in a variety of air- two-stroke engines, from clearing saws to hedge trimmers and power cutters. Aspen 2 is not only ethanol-free, it is also largely free of hazardous components such as benzene and other hydrocarbons. This keeps the engine cleaner, reduces harmful emissions and provides you with a better work experience.