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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.
At a minimum, the diesel fuel you use should
meet the latest version of specification
CAN/CGSB-3.517 (Low Sulfur Diesel) 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 tothe 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.
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, CAN/CGSB-3.517 (Low Sulfur Diesel)
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 your 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 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.
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Page 314 of 430
How to Check Lubricant
To get an accurate reading, the vehicle should be
on a level surface.
If the level is below the bottom of the filler plug
hole, you may need to add some lubricant.
Add enough lubricant to raise the level to the
bottom of the filler plug hole.
What to Use
To determine what kind of lubricant to use see
Part C: Recommended Fluids and Lubricants on
page 397.
Noise Control System
Tampering with Noise Control
System Prohibited
The following information relates to compliance
with federal noise emission standards for vehicles
with a Gross Vehicle Weight Rating (GVWR) of
more than 10,000 lbs (4 536 kg). The Maintenance
Schedule provides information on maintaining
the noise control system to minimize degradation
of the noise emission control system during
the life of your vehicle. The noise control system
warranty is given in your warranty booklet.
These standards apply only to vehicles sold in the
United States.
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Page 329 of 430

{CAUTION:
Without the correct wheel, you may not be
able to stop properly, and you could have
other problems like a tire air-out. You
could have a collision. If you do not go to
your dealer to get a new wheel, be sure
you get the correct one. Each new wheel
should match the original wheel in
load-carrying capacity, in ation pressure
capacity, diameter, width, offset and
mounting con guration.
Using wheels and tires with higher load-carrying
limits than the original wheels and tires does
not change the Gross Axle Weight Rating (GAWR)
or the Gross Vehicle Weight Rating (GVWR) of
your vehicle. SeeLoading Your Vehicle on
page 238for more information.Notice:The wrong wheel can cause trouble in
bearing life, brake cooling,
speedometer/odometer calibration, headlamp
aim, bumper height, vehicle ground clearance,
stopping distance and tire clearance to the
body and chassis. You could also have other
problems like a tire air-out.
Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You cannot know how it has
been used or how far it has been driven. It
could fail suddenly and cause a crash. If
you have to replace a wheel, use a new
GM original equipment wheel.
329