Yes, biodiesel can be blended with fossil diesel in any percentage. The term “biodiesel” refers to 100 percent pure fuel, designated as B100, that meets the American Society for Testing and Materials (ASTM) requirements for biodiesel fuel in its D6751 standard. The term “biodiesel blend” refers to a blend of pure biodiesel with petro-diesel, typically represented by the letter B followed by a number. The number refers to the volumetric percentage of biodiesel. Biodiesel can be used in standard diesel engines in any percentage -- from B1, which is 1% biodiesel mixed with 99% petro-diesel, to pure biodiesel, known as B100.
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