John Deere Clarifies Position on Use of Biodiesel
Engine Models through Tier 3/Stage III A Can Use B20 Biodiesel Blends

Waterloo, Iowa - Due to the variety of standards that exist in the
diesel engine industry and in response to questions from various
markets, John Deere Power Systems (JDPS) is officially clarifying its
position on the use of biodiesel in its diesel engines.

While 5 percent blends (B5) are preferred, biodiesel concentrations up
to a 20 percent blend (B20) in petroleum diesel fuel can be used in
John Deere engines through Tier 3/Stage III A models, including all
non-emissions-certified engines. Biodiesel blends up to B20 can be
used only if the biodiesel (100 percent biodiesel or B100) meets ASTM
D6751 (U.S.), EN 14214 (EU) or equivalent specification. Biodiesel
users are strongly encouraged to purchase biodiesel blends from a
BQ-9000 Certified Marketer and to source from a BQ-9000 Accredited
Producer, as certified by the National Biodiesel Board. Certified
Marketers and Accredited Producers can be found at www.bq-9000.org.

"John Deere's leadership in the use of biodiesel is another example of
our commitment to environmentally friendly engine solutions," said
Brian Brown, manager of worldwide marketing support at John Deere
Power Systems. "Using biodiesel fuel reduces particulate emissions and
decreases dependence on crude oil."



John Deere-approved fuel conditioners containing detergent/dispersant
additives, such as John Deere Premium Biodiesel Fuel Conditioner, are
recommended when using lower biodiesel blends but are required when
using B20 blends.

Biodiesel is a renewable, oxygenated fuel made from agricultural
resources such as soybeans or rapeseeds. It is biodegradable and free
of sulfur.

"We recognize the importance of biofuels to our customers and to the
environment," Brown said. "Use of biofuels in John Deere diesel
engines is the right thing to do from a long-term economic and
environmental standpoint."

John Deere was the first off-highway engine manufacturer to recommend
and factory-fill biodiesel in North America.

"We still get questions about higher biodiesel blends and warranty,
but our position on warranty for customers that use B20 has not
changed," said Grant Suhre, manager of field service for JDPS. "While
we prefer the use of B5 biodiesel blends, we also know that when high
quality B20 blends are available, they work well in John Deere
engines. If customers make sure the biodiesel meets the ASTM D6751
standard, is stored and mixed properly, and is used shortly after
manufacture, they can continue to rely on John Deere engines while
using B20."

John Deere wants every potential biodiesel user to be informed about
the advantages as well as the cautions of using biodiesel. Good
operating practices are very important when using any biodiesel blend.
Visit www.JohnDeere.com/biodiesel for more information on biofuels and
the proper way to use them in John Deere engines.