GMC 2003 GMT560 T-Series Owner's Manual page 162

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It is acceptable to use diesel fuel containing up to 5%
biodiesel (B5), but the final blended fuel must meet
the same specification, ASTM D975–02 (Grade
Low Sulfur), as other fuels used in your vehicle, and the
biodiesel used for making this fuel must meet the
ASTM D6751–02 specification. 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 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.
5-6
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.
{
CAUTION:
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."

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