GMC TopKick 2007 Owner's Manual page 250

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.
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 260.
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.
250
What Fuel to Use in Canada
Canadian fuels are blended for seasonal changes.
Diesel Type "A" fuel is blended for better cold
weather starting (below 0°F or −18°C); however,
you may notice some power and fuel economy
loss. If Type "A" fuel is used in warmer
temperatures, stalling and hard starting may
occur. Diesel Type "B" fuel is blended for
temperatures above 0°F (−18°C).
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. 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.