You wouldn’t dream of putting diesel gasoline in your car’s gasoline engine or try to run a D-cell flashlight with 9-volt batteries. Common sense tells you that the result of trying to operate something with the wrong type of fuel can be futile at best, or worse – it can lead to expensive repairs. Using the right type of fuel is critical in the safe and efficient operation of your STIHL equipment. All STIHL gasoline-powered equipment runs on a 50:1 mixture of gasoline and 2-cycle engine oil. Knowing the proper way to mix your fuel is the first step in keeping it running strong and long.