Biodiesel is a renewable, biodegradable fuel manufactured from plant oils, animal fats or recycled cooking oils. Biodiesel is most commonly used as a blend with petroleum diesel. At concentrations of up to 5 vol% (B5) in conventional diesel fuel, the mixture will meet ASTM D975 diesel fuel specification and can be used in any application as if it were neat petroleum diesel; for home heating oil, B5 will meet the ASTM D396 home heating oil specification.1 At concentrations of 6% to 20% (B6 to B20), biodiesel blends can be used in many applications that use diesel fuel with minor or no modifications to the equipment