Chevrolet 2007 Kodiak Owner's Manual page 254

At a minimum, the diesel fuel you use
should meet the latest version of ASTM
specification D 975 (Grades No. 2-D or No. 1-D
S15 commonly known as Ultra Low Sulfur diesel)
in the United States. In addition, the Engine
Manufacturers Association (EMA) has identified
properties of an improved diesel fuel for better
engine performance and durability. Diesel
fuels corresponding to the EMA Recommended
Guideline on Premium Diesel Fuel (FQP-1A) could
provide better starting, less noise, and better
vehicle performance. If there are questions about
the fuel you are using, contact your fuel supplier.
If your vehicle has the 6.6L engine, it is
acceptable to use diesel fuel containing up to
5% biodiesel (B5), but the final blended fuel must
meet the same specification, ASTM D 975 (Grades
No. 2-D or No. 1-D S15 commonly known as Ultra
Low Sulfur diesel), as other fuels used in your
vehicle, and the biodiesel used for making this
fuel must meet the latest version of ASTM
specification D 6751. Biodiesel is produced from
vegetable oils or animal fat that have been
chemically modified to reduce the possibility of
damage to your fuel system and engine. Higher
concentration (i.e., greater than B5)
biodiesel-containing fuels or the use of
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unmodified bio-oils blended into diesel fuel at any
concentration is not recommended and could
damage your fuel system and engine. Such
damage would not be covered by your warranty. If
there are questions about the biodiesel-containing
fuels you are using, contact your fuel supplier.
Diesel fuel may foam when you fill your tank. This
can cause the automatic pump nozzle to shut
off, even though your tank is not full. If this
happens, just wait for the foaming to stop and
then continue to fill your tank. See Filling the Tank
on page 264.
CAUTION:
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Heat coming from the engine may cause
the fuel to expand and force the fuel out
of your tank. If something ignites the fuel,
a fire could start and people could be
burned. To help avoid this, fill your fuel
tank only until the automatic nozzle shuts
off. Do not try to top it off.