GMC 2010 T-Series Owner's Manual page 156

In the United States, for best results use No. 2-D diesel
fuel year-round (above and below freezing conditions)
as oil companies blend No. 2-D fuel to address climate
differences. No. 1-D diesel fuel can be used in very cold
temperatures (when it stays below 18°C or 0°F);
however, it will produce a power and fuel economy loss.
Avoid the use of No. 1-D diesel fuel in warm or hot
climates. It can result in stalling, poor starting when the
engine is hot, and could damage the fuel injection
system.
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 the 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 the 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.
5-8
Because of the cleansing properties of biodiesel,
switching from straight diesel to a biodiesel blend can
prematurely restrict the fuel filter with normal deposits in
the fuel system. A fuel filter replacement might be
required sooner than the recommended interval.
Diesel fuel can foam when you fill the tank. This can
cause the automatic pump nozzle to shut off, even
though the tank is not full. If this happens, just wait for
the foaming to stop and then try filling the tank more
slowly. See Filling the Tank on page 5 14.
WARNING:
Heat coming from the engine can cause the fuel
to expand and force the fuel out of the tank.
If something ignites the fuel, a fire could start and
people could be burned. To help avoid this, try
filling the tank more slowly and fill the fuel tank
only until the automatic nozzle shuts off. Do not
try to top it off.