Biodiesel can be used as a pure fuel, or blended with petroleum-derived diesel (petrodiesel) in any percentage. Such blends are referred to as BXX wherein XX stands for the percentage by volume of biodiesel in the blend.
B20—a blend of 20% by volume : 80% by volume ____— has demonstrated significant environmental benefits (fewer harmful emissions) with a minimum increase in cost.

A renewable substitute for diesel fuel made from petroleum is biodiesel (hereafter referred to as "petrodiesel").
A lye catalyst, methyl or ethyl alcohol, and the feedstock oil (often soybean oil in the United States) are combined to create biodiesel (sodium hydroxide or potassium hydroxide).
The glycerin is separated from the fatty acid molecules of the feedstock oil during the transesterification process, and each fatty acid molecule then joins an alcohol molecule.
Biodiesel is a domestic, renewable fuel for diesel engines that complies with ASTM D 6751 specifications and is made from natural oils like soybean oil.
To ensure proper performance, fuel-grade biodiesel must be produced in accordance with ASTM D6751, which is a strict industry standard.

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