What Fuel To Use - GMC 2005 T-Series Owner's Manual

What Fuel to Use

In the United States, for best results use Number 2-D
diesel fuel year-round (above and below freezing
conditions) as oil companies blend Number 2-D fuel to
address climate differences. Number 1-D diesel fuel
may be used in very cold temperatures (when it stays
below 0°F or −18°C); however, it will produce a
power and fuel economy loss. Avoid the use of Number
1-D diesel fuel in warm or hot climates. It may result
in stalling, poor starting when the engine is hot and may
damage the fuel injection system.
At a minimum, the diesel fuel you use should meet
specifications ASTM D975-03 (Grade Low Sulfur) 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.
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:
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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.