STIHL BioPlus™ oil is made with a vegetable oil base. This means that the oil is less harmful to humans, animals, micro-organisms and plants.The oil also offers excellent flow characteristics at low temperatures and has high flash point. Available in 1 qt., 1 gal., 5 gal., and 55 gal. containers. Rated by the Coordinating European Council to be 93.8% biodegradable in only 21 days.