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Biodiesel Compatibility in 2007 and Newer Vehicles

Biodiesel Compatibility in 2007 and Newer Vehicles Savebiodiesel.org A grass roots campaign The Issue The emissions technology currently being used in most diesel vehicle models from 2007-2009 has been shown to be incompatible with biodiesel in any blend, from B5 to B100.

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Biodiesel Compatibility in 2007 and Newer Vehicles

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  1. Biodiesel Compatibility in 2007 and Newer Vehicles Savebiodiesel.org A grass roots campaign

  2. The Issue • The emissions technology currently being used in most diesel vehicle models from 2007-2009 has been shown to be incompatible with biodiesel in any blend, from B5 to B100. This poses a great threat to the future of biodiesel as a viable fuel alternative.

  3. How did this happen? • New and more rigorous emissions standards from the Environmental Protection Agency (EPA) and the California Air Resources (CARB) require the incorporation of a diesel particulate filter (DPF) to trap emissions. The issue of incompatibility arises not from the DPF, but rather from the injection process used to create an exothermic reaction which thereby burns off the soot from the combustion cycle.

  4. The Mechanism • Fuel is injected in the cylinder after the combustion cycle as part of the emissions control system. • In the case of biodiesel the late injection of fuel does not fully vaporize as intended. • Biodiesel will adhere to the cylinder walls and leak down past the piston rings into the crankcase.

  5. The Effect • Engine oil dilution • Biodiesel accumulates in the engine oil and can lead to rising engine oil levels. • Biodiesel-oil interactions • Biodiesel is a very polar molecule which interacts strongly with engine oil additives and can lead to a long term increase in engine wear.

  6. Alternative Methods • Exhaust Stream Injection • Used by Caterpillar and Izuzu • This method incorporates an extra fuel injector into the exhaust stream to serve the purpose of DPF regeneration. • Avoids fuel dilution from the cylinder. • Alternative Engine Oil Formulations • Being worked on by Chevron.

  7. Action • Savebiodiesel.org campaign • Informational website and online petition aimed at informing consumers and gathering consumer signatures to present to OEM’s, CARB and the EPA • Gather letters of support from fleets and city agencies. • Ideas?

  8. References • C. Harvey, et al., Comparison of Nitro-polycyclic Aromatic Hydrocarbon Levels in Conventional Diesel and Alternative Diesel Fuels, NREL/CP-540-38494 • Andreae, M., et al., Biodiesel and Fuel Dilution of Engine Oil, SAE 2007-01-4036 • A. Williams, et al., Biodiesel effects on Diesel Particle Filter Performance, Milestone Report, NREL/TP-540-39606 • A. Williams, et al., Effect of Biodiesel Blends on Diesel Particulate Filter Performance, SAE 2006-01-3280 • M. Tatur, et al., Effects of Biodiesel Operation on Light-Duty Tier 2 Engine and Emission Control Systems, NREL/CP-540-42928 • Biodiesel Magazine, www.biodieselmagazine.com/article.jsp?article_id=2290 • Sloan Automotive Laboratory, www1.eere.energy.gov/vehiclesandfuels/pdfs/deer_2007/session5/deer07_sappok.pdf • BiodieselSMARTER Magazine, www.biodieselsmarter.com/archives/2008/12/the_saga_of_the_09_tdi_and_its.php • Gary M. Parsons, Chevron Oronite Corp., Clean Diesel and After-Treatment Systems

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