Engine Oil Life System
(DURAMAX
®Diesel)
When to Change Engine Oil
If your vehicle has the Engine Oil Life System, it has a
computer system that lets you know when to change
the engine oil and filter. This is based on injection timing,
engine load and engine temperature, and not on
mileage. Based on driving conditions, the mileage at
which an oil change will be indicated can vary
considerably. For the oil life system to work properly,
you must reset the system every time the oil is changed.
When the system has calculated that oil life has been
diminished, it will indicate that an oil change is
necessary. A change engine oil light will come on.
SeeChange Engine Oil Light on page 3-38.
Change your oil as soon as possible within the next
600 miles (1 000 km) or 30 hours of engine operation,
whichever occurs first. It is possible that, if you are
driving under the best conditions, the oil life system may
not indicate that an oil change is necessary for over a
year. However, your engine oil and filter must be
changed at least once a year and at this time the system
must be reset. Your dealer has GM-trained service
people who will perform this work using genuine
GM parts and reset the system. It is also important to
check your oil regularly and keep it at the proper level.If the system is ever reset accidentally, you must
change your oil at 3,000 miles (5 000 km), or 150 hours
of engine operation, whichever occurs first, since
your last oil change. Remember to reset the oil life
system whenever the oil is changed.How to Reset the Engine Oil Life
System
The Engine Oil Life System calculates when to change
your engine oil and filter based on vehicle use. Anytime
your oil is changed, reset the system so it can calculate
when the next oil change is required. If a situation occurs
where you change your oil prior to a change engine oil
light being turned on, reset the system.
To reset the Engine Oil Life System, do the following:
1. Turn the ignition key to RUN with the engine off.
2. Fully press and release the accelerator pedal slowly
three times within 10 seconds.
If the change engine oil light flashes for five seconds,
the system is resetting.
3. Turn the key to OFF.
If the change engine oil light comes back on when you
start your vehicle, the Engine Oil Life System has
not reset. Repeat the procedure.
5-31
What to Do with Used Oil
Used engine oil contains certain elements that may be
unhealthy for your skin and could even cause cancer.
Do not let used oil stay on your skin for very long.
Clean your skin and nails with soap and water, or a
good hand cleaner. Wash or properly dispose of
clothing or rags containing used engine oil. See the
manufacturer’s warnings about the use and disposal of
oil products.
Used oil can be a threat to the environment. If you
change your own oil, be sure to drain all the oil from
the filter before disposal. Never dispose of oil by putting
it in the trash, pouring it on the ground, into sewers,
or into streams or bodies of water. Instead, recycle it by
taking it to a place that collects used oil. If you have
a problem properly disposing of your used oil, ask your
dealer, a service station or a local recycling center
for help.
Engine Oil Life System
(Caterpillar
®Diesel Engine)
How to Reset the Engine Oil Life
System
The Engine Oil Life System calculates when to change
your engine oil and filter based on vehicle use.
Anytime your oil is changed, reset the system so it can
calculate when the next oil change is required. If a
situation occurs where you change your oil prior to a
change engine oil light being turned on, reset the
system.
To reset the Engine Oil Life System, do the following:
1. Turn the ignition key to RUN with the engine off.
2. Fully apply and hold the brake pedal while you fully
press and release the accelerator pedal three times
within five seconds.
3. Turn the key to OFF.
If the change engine oil light comes back on when you
start your vehicle, the Engine Oil Life System has
not reset. Repeat the procedure.
5-32
Door Latches Check
Check that doors close, latch, and lock tightly. Check for
broken, damaged, or missing parts that might prevent
tight latching.
Hood Latches Check
Check that the hood closes firmly. Check for broken,
damaged, loose, or missing parts that might prevent
tight latching. Make sure the secondary latch (if
equipped) keeps the hood from opening all the way
when the primary latch is released.
Fluid Leaks Check
Check for fuel, coolant, oil, or other fluid leaks by
looking at the surface beneath the vehicle after it has
been parked for awhile.
Underbody Inspection
Corrosive materials used for ice, snow removal, and
dust control can collect on the underbody. If these
materials are not removed, accelerated corrosion (rust)
can occur on underbody parts such as fuel lines,
frame, floor pan, and exhaust system. At least every
spring, flush these materials from the underbody
with plain water. Take care to clean well any areas
where mud and other debris can collect. Sediment
packed in closed areas of the frame should be loosened
before being flushed.
Engine Cover Check
Check that the cab’s engine cover and seal (if equipped)
are not torn or damaged. Be sure that the cover is
clamped down firmly to the floor.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part C.
Underbody Flushing Service
At least every spring, use plain water to flush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
Tractor Protection (Breakaway)
Valve Check
On air brake models, remove, disassemble, clean and
inspect the tractor protection (breakaway) valve.
6-31
Usage Fluid/Lubricant
Manual
Transmission
(ZF 6-Speed)Synthetic Transmission Fluid
approved to Allison Transmission
®
specification TES-295
(GM Part No. U.S. 12378515, in
Canada 88900701).
Automatic
TransmissionSee the Allison Transmission
®
Operator’s Manual for correct
transmission fluid.
Key Lock
CylindersMulti-Purpose Lubricant, Superlube
(GM Part No. U.S. 12346241, in
Canada 10953474).
Chassis
LubricationChassis Lubricant
(GM Part No. U.S. 12377985, in
Canada 88901242) or lubricant
meeting requirements of NLGI #2,
Category LB or GC-LB.
Front Wheel
Bearings
(Except Oil
Filled Hubs)Wheel bearing lubricant meeting
requirements of NLGI #2,
Category GC or GC-LB
(GM Part No. U.S. 1051344, in
Canada 993037).
Front Wheel
Bearings with
Oil Filled HubsSAE 75W-90 Synthetic Axle
Lubricant for Medium Duty Trucks
(GM Part No. U.S. 89021675, in
Canada 10953512).
Transfer Case
(Four-Wheel
Drive)DEXRON
®-III Automatic
Transmission Fluid. Look for
“Approved for the H-Specification”
on the label.
Usage Fluid/Lubricant
Front Axle
(Four-Wheel
Drive)SAE 75W-90 Synthetic Axle
Lubricant for Medium Duty Trucks
(GM Part No. U.S. 89021675, in
Canada 10953512).
Rear Axle and
Rear HubsSAE 75W-90 Synthetic Axle
Lubricant for Medium Duty Trucks
(GM Part No. U.S. 89021675, in
Canada 10953512).
Rear Axle Shift
Motor LubricantRefrigerant Oil
(GM Part No. U.S. 5416939, in
Canada 10953496).
Propshafts and
SplinesWheel bearing lubricant meeting
requirements of NLGI #2,
Category GC or GC-LB
(GM Part No. U.S. 1051344, in
Canada 993037).
Cab — Door
Hinges and
LatchesMulti-Purpose Lubricant, Superlube
(GM Part No. U.S. 12346241, in
Canada 10953474).
Weatherstrip
ConditioningDielectric Silicone Grease
(GM Part No. U.S. 12345579, in
Canada 992887).
Weatherstrip
SqueaksSynthetic Grease with
Teflon, Superlube
(GM Part No. U.S. 12371287, in
Canada 10953437).
6-33
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.
GM 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 owners with towing service for
disabled vehicles.
This service combines the efforts of trained telephone
representatives with a network of GM Medium Duty
Truck’s dealer services.
Just dial GM Medium Duty Truck Roadside Assistance
at 1-800-862-4389 to reach a qualified representative
who can assist you in a repair or arrange a tow. Other
recommended services can also be arranged for
situations such as retrieving locked in keys, changing a
tire, or delivering gasoline, at a charge to the customer.
We also provide dealer information at no charge,
such as location of the nearest authorized medium duty
GM Truck dealer and their hours of operation.
Roadside Assistance is available 24 hours a day,
7 days a week, 365 days a year. Should you have any
questions about Roadside Assistance, call the GM
Medium Duty Truck Roadside Assistance Center
or contact your dealer.
7-5
J
Jump Starting.................................................5-56
K
Keyless Entry System....................................... 2-3
Keys............................................................... 2-2
L
Lamps
Dome........................................................3-16
Exterior......................................................3-14
Marker.......................................................3-16
Reading.....................................................3-17
Light
Airbag Off..................................................3-28
Airbag Readiness........................................3-27
Anti-Lock Brake System Warning...................3-34
Brake System Warning.................................3-31
Change Engine Oil......................................3-38
Charging System.........................................3-30
Check Gages Warning.................................3-42
Daytime Running Lamps Indicator..................3-41
Differential Lock Indicator..............................3-40Light (cont.)
Engine Overspeed Warning...........................3-39
Engine Shutdown Warning............................3-39
Exhaust Brake Indicator................................3-40
Highbeam On.............................................3-41
Low Coolant Warning...................................3-35
Low Oil Level.............................................3-38
Low Washer Fluid Warning...........................3-42
Malfunction Indicator....................................3-36
Range Inhibit Warning Indicator.....................3-31
Reduced Engine Power................................3-41
Safety Belt Reminder...................................3-27
Safety Belt Reminder Tone...........................3-27
Service Transmission Warning.......................3-31
Trailer Anti-Lock Brake System Warning..........3-34
Wait to Start Indicator..................................3-36
Water in Fuel Warning.................................3-43
Lighting
Entry.........................................................3-17
Loading Your Vehicle.......................................4-32
Locks
Door........................................................... 2-6
Power Door.................................................. 2-7
Loss of Control...............................................4-15
Low Coolant Warning Light..............................3-35
Low Washer Fluid Warning Light.......................3-42
8
Reading Lamps..............................................3-17
Rear Axle......................................................5-60
Differential Lock Control................................. 4-9
Shift Motor.................................................5-62
Two-Speed Electric Shift Control....................2-26
Rear Heating System......................................3-24
Rear Seat Operation......................................... 1-8
Rear Seat Passengers, Safety Belts..................1-24
Rearview Mirrors.............................................2-45
Reclining Seatbacks.......................................... 1-4
Reduced Engine Power Light............................3-41
Remote Keyless Entry System............................ 2-3
Remote Keyless Entry System, Operation............ 2-4
Reporting Safety Defects
Canadian Government................................... 7-7
General Motors............................................. 7-8
United States Government.............................. 7-7
Restraint System Check
Checking the Restraint Systems....................1-60
Replacing Restraint System Parts
After a Crash..........................................1-60
Right Front Passenger Position, Safety Belts......1-22
Roadside
Assistance Program....................................... 7-5
Rocking Your Vehicle to Get it Out....................4-30
Running Out of Fuel........................................5-15
Running the Engine While Parked.....................2-44S
Safety Belt
Reminder Light............................................3-27
Reminder Tone............................................3-27
Safety Belts
Care of......................................................5-82
Center Passenger Position............................1-22
Driver Position............................................1-14
How to Wear Safety Belts Properly................1-14
Questions and Answers About Safety Belts.....1-13
Rear Seat Passengers.................................1-24
Right Front Passenger Position......................1-22
Safety Belt Extender....................................1-26
Safety Belt Use During Pregnancy.................1-22
Safety Belts Are for Everyone......................... 1-9
Shoulder Belt Height Adjuster........................1-21
Safety Warnings and Symbols.............................. iii
Scheduled Maintenance..................................... 6-5
Scheduled Maintenance Supplements.................. 6-5
Seats
Air Suspension Seats.................................... 1-6
Manual........................................................ 1-2
Rear Seat Operation...................................... 1-8
Reclining Seatbacks...................................... 1-4
Split Bench Seat........................................... 1-6
11