Biodiesel, made from animal fat or vegetable oil, is a renewable pollution-reducing alternative to petroleum diesel. It is made by transforming animal fat or vegetable oil with alcohol, and can be directly substituted for diesel either as neat fuel (B100) or as an oxygenate additive (typically 20%—B20). B20 earns credits for alternative fuel use under [...]

Biodiesel refers to a non-petroleum-based diesel fuel consisting of short chain alkyl (methyl or ethyl) esters, typically made by transesterification of vegetable oils or animal fats, which can be used (alone, or blended with conventional petrodiesel) in unmodified diesel-engine vehicles. Biodiesel is distinguished from the straight vegetable oil (SVO) (aka “waste vegetable oil”, “WVO”, “unwashed [...]