
Part C: Recommended Fluids and
Lubricants
Fluids and lubricants identified below by name, part
number, or specification can be obtained from your
dealer/retailer.
Usage Fluid/Lubricant
Engine Oil
(Gasoline
Engine)Engine oil which meets GM Standard
GM6094M and displays the
American Petroleum Institute (API)
Certified for Gasoline Engines
starburst symbol. To determine the
proper viscosity for your vehicle’s
engine, see “Engine Oil” in the Index.
Engine Oil
(DURAMAX
®/
Isuzu Diesel
Engines)Engine oils with the letters CJ-4 are
required for your vehicle. The CJ-4
designation can appear either alone
or in combination with other
American Petroleum Institute (API)
designations, such as API CJ-4/SL.
These letters show API levels of
quality. To determine the preferred
viscosity for your vehicle’s diesel
engine, see “Engine Oil” in the Index.
Engine Oil
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine oil
recommendations.
Usage Fluid/Lubricant
Engine Coolant
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine
coolant recommendations.
Engine Coolant
(Gasoline
Engine &
DURAMAX
®/
Isuzu Diesel
Engines)50/50 mixture of clean, drinkable
water and use only DEX-COOL
®
Coolant. SeeEngine Coolant
(Caterpillar Diesel Engines) on
page 5-47.
Hydraulic Brake
SystemDelco
®Supreme 11 Brake Fluid or
equivalent DOT-3 brake fluid.
Windshield
Washer SolventOptikleen
®Washer Solvent.
Clutch Bearing
LubricantClutch Bearing Lubricant (GM Part
No. 12378484 or equivalent NLGI
#3 consistency).
Exhaust Brake
Ball Joint Cap
LubricantHigh-Temperature Grease
(GM Part No. U.S. 1051344,
in Canada 903037) or NLGI #3
consistency.
Power Steering
SystemDEXRON
®-VI Automatic
Transmission Fluid.
Manual
TransmissionSynthetic Manual Transmission Fluid
(GM Part No. U.S. 88861952,
in Canada 88861953).
Automatic
TransmissionSee the Allison Transmission
®
Operator’s Manual for correct
transmission fluid.
6-31

Customer Assistance and Information...............7-2
Customer Satisfaction Procedure......................7-2
Customer Assistance for Text Telephone
(TTY) Users...............................................7-4
Customer Assistance Offices............................7-4
GM Mobility Reimbursement Program................7-5
Roadside Assistance Program..........................7-5
Collision Damage Repair.................................7-6
Reporting Safety Defects..................................7-9
Reporting Safety Defects to the
United States Government............................7-9
Reporting Safety Defects to the
Canadian Government.................................7-9
Reporting Safety Defects to
General Motors...........................................7-9
Service Publications Ordering Information.........7-10Vehicle Data Recording and Privacy................7-11
Vehicle Data Recording and Privacy
(Isuzu 7.8L L6 Engine)...............................7-11
Event Data Recorders
(Isuzu 7.8L L6 Engine)...............................7-12
OnStar
®(Isuzu 7.8L L6 Engine)......................7-13
Navigation System (Isuzu
7.8L L6 Engine)........................................7-13
Radio Frequency Identification (RFID)
(Isuzu 7.8L L6 Engine)...............................7-13
Section 7 Customer Assistance Information
7-1

GM Mobility Reimbursement
Program
This program, available to qualified applicants, can
reimburse you up to $1,000 of the cost of eligible
aftermarket adaptive equipment required for your vehicle,
such as hand controls or a wheelchair/scooter lift.
The offer is available for a very limited period of time
from the date of vehicle purchase/lease. For more
details, or to determine your vehicle’s eligibility, visit
gmmobility.com or call the GM Mobility Assistance
Center at 1-800-323-9935. Text telephone (TTY) users,
call 1-800-833-9935.
General Motors of Canada also has a Mobility Program.
Call 1-800-GM-DRIVE (463-7483) for details. TTY
users call 1-800-263-3830.
Roadside Assistance Program
GM Medium Duty truck’s Roadside Assistance provides
stranded owner/operators with towing service for
disabled GM Medium Duty trucks, during the base
and/or engine warranty period, to the nearest authorized
GM Medium Duty dealer. This service combines the
efforts of trained telephone representatives with a
network of GM Medium Duty truck services.
Call GM Medium Duty truck’s Roadside Assistance at
1-800-862-4389 to reach a qualified representative who
can assist you in arranging a tow to the nearest GM
Medium Duty truck dealer when your vehicle is disabled.
We also provide dealer information at no charge,
such as location of the nearest authorized GM Medium
Duty truck dealer and their hours of operation.
Our Roadside Assistance is available 24 hours a day,
7 days a week, 365 days a year which includes
weekends and holidays. Should you have questions
about GM Medium Duty truck Roadside Assistance, call
the GM Medium Duty Roadside Assistance Center or
contact your dealer.
Canadian Roadside Assistance
Whenever a Medium Duty truck owned and operated in
Canada becomes disabled, the owner/operator should
contact the Canadian Roadside Assistance Center
at 1-800-268-6800 for assistance.
7-5

Service Publications Ordering
Information
Service Manuals
Service Manuals have the diagnosis and repair
information on engines, transmission, axle suspension,
brakes, electrical, steering, body, etc.
Service Bulletins
Service Bulletins give additional technical service
information needed to knowledgeably service General
Motors cars and trucks. Each bulletin contains
instructions to assist in the diagnosis and service of
your vehicle.
Owner Information
Owner publications are written specifically for owners
and intended to provide basic operational information
about the vehicle. The owner manual includes the
Maintenance Schedule for all models.
In-Portfolio: Includes a Portfolio, Owner Manual, and
Warranty Booklet.
RETAIL SELL PRICE: $35.00 (U.S.) plus processing fee
Without Portfolio: Owner Manual only.
RETAIL SELL PRICE: $25.00 (U.S.) plus processing fee
Current and Past Model Order Forms
Technical Service Bulletins and Manuals are available
for current and past model GM vehicles. To request
an order form, specify year and model name of
the vehicle.
7-10

ORDER TOLL FREE: 1-800-551-4123
Monday-Friday 8:00 AM - 6:00 PM
Eastern Time
For Credit Card Orders Only
(VISA-MasterCard-Discover), visit Helm, Inc.
on the World Wide Web at: helminc.com
Or you can write to:
Helm, Incorporated
P.O. Box 07130
Detroit, MI 48207
Prices are subject to change without notice and without
incurring obligation. Allow ample time for delivery.
Note to Canadian Customers: All listed prices are
quoted in U.S. funds. Canadian residents are to make
checks payable in U.S. funds.
Vehicle Data Recording and
Privacy
Vehicle Data Recording and Privacy
(Isuzu 7.8L L6 Engine)
Your GM vehicle has a number of sophisticated
computers that record information about the vehicle’s
performance and how it is driven. For example,
your vehicle uses computer modules to monitor and
control engine and transmission performance, to monitor
the conditions for airbag deployment and deploy
airbags in a crash and, if so equipped, to provide
antilock braking to help the driver control the vehicle.
These modules may store data to help your
dealer/retailer technician service your vehicle. Some
modules may also store data about how you operate the
vehicle, such as rate of fuel consumption or average
speed. These modules may also retain the owner’s
personal preferences, such as radio pre-sets, seat
positions, and temperature settings.
7-11

Event Data Recorders
(Isuzu 7.8L L6 Engine)
This vehicle has an Event Data Recorder (EDR).
The main purpose of an EDR is to record, in certain
crash or near crash-like situations, such as an airbag
deployment or hitting a road obstacle, data that will
assist in understanding how a vehicle’s systems
performed. The EDR is designed to record data related
to vehicle dynamics and safety systems for a short
period of time, typically 30 seconds or less. The EDR
in this vehicle is designed to record such data as:
•How various systems in your vehicle were operating
•Whether or not the driver and passenger safety
belts were buckled/fastened
•How far, if at all, the driver was pressing the
accelerator and/or brake pedal
•How fast the vehicle was traveling
This data can help provide a better understanding of the
circumstances in which crashes and injuries occur.Important:EDR data is recorded by your vehicle only
if a non-trivial crash situation occurs; no data is recorded
by the EDR under normal driving conditions and no
personal data (e.g., name, gender, age, and crash
location) is recorded. However, other parties, such as law
enforcement, could combine the EDR data with the type
of personally identifying data routinely acquired during a
crash investigation.
To read data recorded by an EDR, special equipment is
required, and access to the vehicle or the EDR is
needed. In addition to the vehicle manufacturer, other
parties, such as law enforcement, that have the special
equipment, can read the information if they have
access to the vehicle or the EDR.
GM will not access this data or share it with others
except: with the consent of the vehicle owner or, if the
vehicle is leased, with the consent of the lessee; in
response to an official request of police or similar
government office; as part of GM’s defense of litigation
through the discovery process; or, as required by law.
Data that GM collects or receives may also be used for
GM research needs or may be made available to others
for research purposes, where a need is shown and the
data is not tied to a specific vehicle or vehicle owner.
7-12

OnStar®(Isuzu 7.8L L6 Engine)
If your vehicle has OnStar and you subscribe to the
OnStar services, please refer to the OnStar Terms and
Conditions for information on data collection and use.
Navigation System (Isuzu
7.8L L6 Engine)
If your vehicle has a navigation system, use of the
system may result in the storage of destinations,
addresses, telephone numbers, and other trip
information. Refer to the navigation system operating
manual for information on stored data and for deletion
instructions.
Radio Frequency Identification
(RFID) (Isuzu 7.8L L6 Engine)
RFID technology is used in some vehicles for functions
such as tire pressure monitoring and ignition system
security, as well as in connection with conveniences
such as key fobs for remote door locking/unlocking and
starting, and in-vehicle transmitters for garage door
openers. RFID technology in GM vehicles does not use
or record personal information or link with any other
GM system containing personal information.
7-13

A
Accessories and Modifications............................ 5-3
Accessory Power Outlets.................................3-19
Adding a Snow Plow or Similar Equipment.........4-22
Adding Equipment to Your Airbag-Equipped
Vehicle.......................................................1-58
Additives, Fuel................................................. 5-7
Add-On Electrical Equipment............................5-95
Air Cleaner/Filter, Engine.................................5-38
Air Conditioning..............................................3-20
Air Pressure Gage..........................................3-47
Air Suspension...............................................2-44
Air Suspension Seats........................................ 1-6
Airbag
Off Light.....................................................3-28
Readiness Light..........................................3-27
Airbag System................................................1-48
Adding Equipment to Your Airbag-Equipped
Vehicle...................................................1-58
Airbag Off Switch........................................1-55
How Does an Airbag Restrain?......................1-53
Servicing Your Airbag-Equipped Vehicle..........1-58
What Makes an Airbag Inflate?......................1-53
What Will You See After an Airbag
Inflates?..................................................1-54
When Should an Airbag Inflate?....................1-52
Where Are the Airbags?...............................1-50Antenna, Fixed Mast.......................................3-58
Antilock Brake System (ABS)............................. 4-5
Antilock Brake, System Warning Light................3-33
Antilock Brakes, Trailer System
Warning Light.............................................3-34
Appearance Care
Aluminum or Chrome-Plated Wheels..............5-92
Care of Safety Belts....................................5-89
Chemical Paint Spotting...............................5-93
Cleaning Exterior Lamps/Lenses....................5-90
Fabric/Carpet..............................................5-88
Finish Care.................................................5-90
Finish Damage............................................5-93
Instrument Panel, Vinyl, and Other
Plastic Surfaces.......................................5-89
Interior Cleaning..........................................5-87
Sheet Metal Damage...................................5-93
Tires..........................................................5-92
Underbody Maintenance...............................5-93
Washing Your Vehicle...................................5-90
Weatherstrips..............................................5-89
Windshield and Wiper Blades........................5-91
Ashtray.........................................................3-19
Audio System.................................................3-48
Chime Level Adjustment...............................3-58
Fixed Mast Antenna.....................................3-58
Radio Reception..........................................3-58
Setting the Clock.........................................3-48
Theft-Deterrent Feature................................3-57
1