Diesel and biodiesel are two carbon-based organic products, extracted from different sources. Biodiesel is the name of a clean burning alternative fuel, produced from, renewable resources. Biodiesel contains no petroleum, but it can be blended with petroleum diesel to create a biodiesel blend. It can be used in compression-ignition (diesel) engines with little or no modifications.
Biodiesel has the same uses as Clear ULSD and Dyed ULSD. B-5 is a blend of 5% biodiesel with 95% petroleum diesel, whereas, B-20 is a blend of 20% biodiesel with 80% petroleum diesel.