Biodiesel is made through a chemical process called transesterification whereby the glycerin is separated from the fat or vegetable oil. The process leaves behind two products – methyl esters and glycerin.Made from an increasingly diverse mix of resources such as recycled cooking oil, soybean oil and animal fats, biodiesel is a renewable, clean-burning diesel replacement that can be used in existing diesel engines without modification. It is the nation’s first domestically produced, commercially available advanced biofuel.Biodiesel’s early growth was careful and deliberate, with a focus on sustainability for the industry. Biodiesel works seamlessly with existing infrastructure and vehicles, and the industry has spent significant time documenting and showcasing the fuel’s abilities. Today, more than 78 percent of diesel vehicles coming off production lines are approved for up to B20 use. Fuel-grade biodiesel must be produced to strict industry specifications in order to ensure proper performance.