What Fuel To Use - GMC TopKick 2007 Owner's Manual

What Fuel to Use

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
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 No. 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.
It is important that diesel-powered trucks are
refueled only with ultra low-sulfur fuel. The
emission control system requires the use of diesel
fuel with ultra low-sulfur (0.0015% by weight, or
15 ppm, maximum) content. Both ultra low-sulfur
and higher sulfur diesel fuels are available in
the United States and ultra low-sulfur diesel fuel is
available in Canada. However, only higher
sulfur diesel fuel is available in Mexico. Use of
fuels with higher-sulfur content will affect the
function of the emission components and may
cause reduced performance, excessive smoke,
and unpleasant odor.
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.
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