TruFuel 32 oz. 40:1 Pre-Mixed Fuel & Oil. It is specially formulated for all 2 Cycle Trimmers, Chainsaws, and All 2 Cycle Air Cooled Engines. This synthetic oil with ethanol-free gasoline ensures better lubrication and performance, reducing smoke, plug fouling, and engine deposits while extending engine life. Convenient and ready to use, TruFuel saves time and delivers great performance. It comes in a resealable container with a 2-year shelf life after opening.