GMC T-Series 2007 Owner's Manual page 197

What Fuel to Use in Canada
Notice: Use of diesel fuel other than Ultra
Low Sulfur Diesel (15 ppm sulfur maximum)
or engine oil other than low ash CJ-4 oil
will cause permanent damage to the DPF
and related components. This damage
would not be covered by your warranty.
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 Diesel and Low 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.
At a minimum, the diesel fuel you use should meet
the latest version of specification CAN/CGSB-3.517
(ULS) in Canada. In addition, the Engine
Manufacturers Association (EMA) has identified
properties of an improved diesel fuel for better
engine performance and durability (FQP-1A).
Diesel fuels corresponding to the EMA description
could provide better starting, less noise, and better
vehicle performance. If there are questions about
the fuel you are using, contact your fuel supplier.
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 might 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 acceptable to use diesel fuel containing
up to 5% biodiesel (B5), but the final blended
fuel must meet the same specification,
CAN/CGSB-3.517 (ULS) in Canada, 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.
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