Biodiesel is a renewable alternative fuel produced from a wide range of vegetable oils and animal fats. Pure biodiesel or biodiesel blended with petroleum diesel can be used to fuel diesel vehicles, providing energy security and emissions and safety benefits. Biodiesel is most commonly available as B20 (20 percent biodiesel, 80 percent regular diesel) or B100 (100 percent biodiesel) blends. Biodiesel can be used for all diesel fuel engines from passenger cars to Class-8 trucks.