The Car and Truck Fleet and Leasing Management Magazine

ASTM Approves New Biodiesel Blend Specifications

July 02, 2008

VANCOUVER, B.C. – The ASTM International D02 Main Committee approved a trio of long-awaited ASTM specifications for biodiesel blends. After more than five years of extensive research and subsequent balloting by the ASTM fuel experts in the blended fuel balloting process, ASTM has finally voted to approve three key sets of biodiesel specifications that should significantly bolster automaker support and consumer demand for biodiesel:



  • Changes to the existing B-100 biodiesel blend stock specification (ASTM D6751).
  • Finished specifications to include up to five percent biodiesel (B-5) in the conventional petrodiesel specification (ASTM D975).
  • A new specification for blends of between six percent biodiesel (B-6) to 20 percent biodiesel (B-20) for on and off road diesel.


Automakers and engine manufacturers have been requesting a finished blend specification for B-20 biodiesel blends for several years, with some citing the need for that spec as the single greatest hurdle preventing their full-scale acceptance of B-20 use in their diesel vehicles.

“The new ASTM specifications for B-6-B-20 blends will aid engine manufacturers in their engine design and testing processes to optimize the performance of vehicles running on biodiesel,” said Steve Howell, chairman of the ASTM Biodiesel Task Force. “The new specifications will also help ensure that only the highest quality biodiesel blends are made available to consumers at the retail pump.”

Chrysler LLC was instrumental in working with the ASTM task force toward B-20 specification development and approval, having supported fleet use of B-20 in its Dodge Ram diesel pickups since January 2006. And currently GM accepts the use of B-5 in all of its diesel vehicles, and offers B-20 use as a Special Equipment Option (SEO).

The SEO is available to government fleets on specific configurations of the Chevy Silverado and GMC Sierra Heavy Duty Pickups, as well as the GMC Savanna and Chevy Express Commercial Cutaway Vans.

The approval of ASTM specifications for inclusion of up to five percent biodiesel (B-5) in the regular diesel fuel pool also means that biodiesel could soon become more readily available at retail fueling stations nationwide.

The ASTM International Main Committee also approved a fourth set of specifications for inclusion of B-5 biodiesel in heating oil. Marketed as Bioheat, biodiesel is gaining popularity as a home heating oil, particularly in the Northeast United States.


Biodiesel must be properly processed to meet the approved ASTM specifications regardless of the feedstock used to produce it. Biodiesel blends up to B-20 meeting ASTM specifications can be used in any diesel engine without modifications, and nearly all major automakers and engine manufacturers in the United States currently accept the use of at least B-5, with some companies — such as Caterpillar, Cummins, John Deere, and New Holland — already accepting blends of B-20 or higher. Several more companies are expected to raise their approvals to B-20 now that the final ASTM specifications for B-6-B-20 blends have been approved.

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