Biodiesel is an alternative to petroleum diesel for fuel in any diesel engine. Biodiesel can be used undiluted as B100 (100% biodiesel) or blended with petroleum diesel (B20 and B5 are popular blends using 20% and 5% biodiesel respectively).  Biodiesel is less polluting than petroleum diesel:

• Reductions in carbon monoxide emissions of 10 percent (B-20) and 50 percent (B-100).
• Reductions in particulate emissions of 15 percent (B-20) and 70 percent (B-100).
• Reductions in total hydrocarbon emissions of 10 percent (B-20) and 40 percent (B-100).
• Reductions in sulfate emissions of 20 percent (B-20) and 100 percent (B-100).
• Slight increase in nitrogen oxide emissions of two percent (B-20) and nine percent (B-100).

Biodiesel also offers advantages over petroleum diesel:

• Improved lubrication of engine
• Renewable and Sustainable fuel (obtained from plant seeds - soybean, canola, etc.)
• Supports domestic agriculture and jobs
• Reduces dependence on foriegn sources of oil (OPEC)