Eliminate the hassle of mixing your own oil and fuel mixture with STIHL premixed fuel. It doesn’t contain ethanol and maintains its stability for up to two years after the seal is broken. STIHL premixed fuel works in all STIHL gasoline-powered equipment. It can be stored longer and will stay fresh in your equipment during storage. Better yet, it is non-aromatic and the engine oil is fully synthetic and highly biodegradable. You’ll love it not only for its convenience and its superior protection, but also because it is environmentally conscious.