Things you should know before filling up with biodiesel

Willing to spend an extra 10 cents a gallon to reduce air pollution? Although most newer cars and trucks run fine on a blend of petroleum and biodiesel, there are some important things to consider before filling up.

“How much is in there? Blends are referred to by the percentage of biodiesel in them. For example, B2 contains 2 percent biodiesel, B5 has 5 percent, etc.

“Engine warranties: Most manufacturers don’t support or discourage the use of biodiesel. Using biodiesel usually will not void an engine’s materials and workmanship warranty, although any damage done by fuel will not be covered. Most companies follow the Engine Manufacturing Association, which stated in 2003 that blends up to 5 percent are fine. Manufacturers caution that there is a higher risk of problems with blends above that.

“What problems? Biodiesel is a natural solvent. If a vehicle has a painted or otherwise coated fuel tank, higher-percentage blends can dissolve the coating and clog fuel systems. The same thing can happen with gunk settled at the bottom of tanks on older vehicles. Biodiesel also can degrade certain types of rubber in hoses and gaskets. Some fuel injection sensors may detect biodiesel differently than regular diesel.

Those issues aren’t a problem with B2, according to the National Biodiesel Board, which represents biodiesel producers.

“Performance: Biodiesel has up to 8 percent less energy than petrodiesel. That translates to about a 1 percent drop in power and gas mileage for a B20 blend.

“Storage: As with regular diesel, microbes will turn biodiesel to sludge if it is stored long enough. Most recommendations call for biodiesel to be used within six months.

“Cold weather: B2 can be used in all climates. Biodiesel will gel at higher temperatures than regular diesel, and higher blends may require additives or heated storage.

Central Valley Schools have used B20 year-round since 2003 without any major problems.

“Buying it: B20 is available at the the Pacific Pride cardlock station at 18826 E. Appleway in Spokane Valley, also known as the City Service Valcon station. Monday it cost $2.89 per gallon, 10 cents more than regular diesel.

“Learn more: The National Biodiesel Board, www.biodiesel.org, has information on the fuel. The Engine Manufacturers Association, www.enginemanufacturers.org, posts its policies online.