STP Premium 2-Cycle Oil with Fuel Stabilizer 40:1 meets JASO FD certification specifications* and is scientifically formulated for outdoor power equipment to help maintain maximum engine performance. Engineered with anti-wear technology to help reduce friction, its premium formulation helps keep the fuel system clean and smoke exhaust low. Plus, it contains fuel stabilizer to keep fuel fresh during infrequent use. Thoroughly mix contents of the bottle into one gallon of unleaded gasoline for 40:1 ratio. Can be used with string trimmers, chainsaws, leaf blowers, and other air cooled 2-cycle gasoline powered small engines (refer to owner’s manual). *Based on available manufacturers' recommendation.