The "Original" premium two-cycle premix racing castor! Formulated from the cleanest-burning, highest grade, triple-filtered castor. Blends with all fuel types including methanol to provide sustained performance at high internal temperatures and RPMs. Contains a rust inhibitor and seal preservative. (Viscosity: 40W) Get that Blendzall smell! Separation may occur with some gasoline in temperatures below 35 degrees Fahrenheit. Add 2 oz. #490 Power Booster to one gal. gasoline to eliminate separation.