Engine Oil Life System (Gasoline
Engine)
When to Change Engine Oil
Your vehicle has a computer system that lets you know
when to change the engine oil and filter. This is based
on engine revolutions 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. See
Change Engine Oil Light on page 3-38. Change the oil as
soon as possible within the next 600 miles (1 000 km).
It is possible that, if you are driving under the best
conditions, the oil life system might not indicate that an oil
change is necessary for over a year. However, the engine
oil and filter must be changed at least once a year and at
this time the system must be reset. Your dealer/retailer
has trained service people who will perform this work
using genuine parts and reset the system. It is also
important to check the oil regularly and keep it at the
proper level.If the system is ever reset accidentally, you must
change the oil at 3,000 miles (5 000 km) 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
the engine oil and filter based on vehicle use. Whenever
the oil is changed, reset the system so it can calculate
when the next oil change is required. If a situation occurs
where you change the oil prior to a change engine oil light
being turned on, reset the system.
To reset the change engine oil light:
1. Turn the ignition key to ON/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.
5-36
How to Reset the Engine Oil Life
System
The Engine Oil Life System calculates when to change
the engine oil and filter based on vehicle use. Whenever
the oil is changed, reset the system so it can calculate
when the next oil change is required. If a situation occurs
where you change the oil prior to a change engine oil light
being turned on, reset the system.
To reset the Engine Oil Life System:
1. Turn the ignition key to ON/RUN with the
engine off.
2. Fully press and release the accelerator pedal slowly
three times within five seconds.
If the change engine oil light is turned off, 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.
What to Do with Used Oil
Used engine oil contains certain elements that can 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 used oil, ask your dealer/retailer, a
service station, or a local recycling center for help.
5-38
Engine Oil Life System
(Caterpillar
®Diesel Engine)
How to Reset the Engine Oil Life
System
The Engine Oil Life System calculates when to change
the engine oil and filter based on vehicle use. Whenever
the oil is changed, reset the system so it can calculate
when the next oil change is required. If a situation occurs
where you change the oil prior to a change engine oil light
being turned on, reset the system.
To reset the Engine Oil Life System:
1. Turn the ignition key to ON/RUN with the
engine off.
2. Fully apply and hold the brake pedal while you fully
press and release the accelerator pedal, pausing
slightly at each press and each release, 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.
Engine Air Cleaner/Filter
DURAMAX®Diesel
6.6L EngineV8 Gas and CAT and
Isuzu 6H Diesel Engines
5-39
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 the
vehicle has one, 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.
6-30
Usage Fluid/Lubricant
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)Manual Transmission Fluid
(GM Part No. U.S. 88861800, in
Canada 88861801).
Front Axle
(Four-Wheel
Drive)SAE 75W-90 Synthetic Axle
Lubricant for Medium Duty Trucks
(GM Part No. U.S. 89021675, in
Canada 10953512).
Usage Fluid/Lubricant
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
ConditioningWeatherstrip Lubricant
(GM Part No. U.S. 3634770, in
Canada 10953518) or
Dielectric 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).
6-32
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.
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 Identi cation
(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.
7-12
Gage (cont.)
Speedometer..............................................3-26
Tachometer.................................................3-26
Transmission Temperature.............................3-39
Voltmeter Gage...........................................3-31
Gasoline
Octane........................................................ 5-7
Specifications............................................... 5-7
Gasoline Engine, Starting.................................2-12
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Headlamp Wiring...........................................5-102
Headlamps
Bulb Replacement.......................................5-76
Daytime Running Lamps...............................3-15
Exterior Lamps............................................3-14
High/Low Beam Changer................................ 3-8
On Reminder..............................................3-15
Heater...........................................................3-20
High Idle System............................................2-20
Highbeam On Light.........................................3-41
Highway Hypnosis...........................................4-15
Hill and Mountain Roads..................................4-15Hood
Checking Things Under................................5-22
Latches......................................................5-22
Horn............................................................... 3-6
Hourmeter Gage.............................................3-46
How to Wear Safety Belts Properly...................1-16
I
Ignition Positions.............................................2-11
Infants and Young Children, Restraints...............1-31
Inflation - Tire Pressure...................................5-82
Instrument Panel
Overview..................................................... 3-4
Switchbank.................................................3-18
Instrument Panel (I/P)
Brightness..................................................3-16
Cluster.......................................................3-25
J
Jump Starting.................................................5-67
K
Keyless Entry System....................................... 2-3
Keys............................................................... 2-2
6
Reduced Engine Power Light............................3-41
Remote Keyless Entry (RKE) System.................. 2-3
Remote Keyless Entry (RKE) System,
Operation..................................................... 2-4
Replacement Parts, Maintenance.....................5-115
Reporting Safety Defects
Canadian Government................................... 7-9
General Motors............................................. 7-9
United States Government.............................. 7-9
Restraint System Check
Checking the Restraint Systems....................1-60
Replacing Restraint System Parts After
a Crash..................................................1-61
Roadside
Assistance Program....................................... 7-5
Rocking Your Vehicle to Get it Out....................4-20
Routing, Engine Drive Belt..............................5-117
Running Out of Fuel...............................2-50, 5-17
S
Safety Belt
Reminder Light............................................3-27
Safety Belts
Care of......................................................5-96
How to Wear Safety Belts Properly................1-16
Lap Belt.....................................................1-27
Lap-Shoulder Belt........................................1-24
Safety Belt Extender....................................1-28Safety Belts (cont.)
Safety Belt Use During Pregnancy.................1-26
Safety Belts Are for Everyone.......................1-11
Safety Warnings and Symbols.............................. iii
Scheduled Maintenance..................................... 6-4
Scheduled Maintenance Supplements.................. 6-4
Seats
Air Suspension Seats.................................... 1-6
Bucket Seats................................................ 1-2
Rear Seat Operation....................................1-10
Split Bench Seat........................................... 1-6
Securing a Child Restraint
Center Front Seat Position............................1-44
Center Rear Seat Position............................1-42
Rear Outside Seat Position...........................1-40
Right Front Seat Position..............................1-44
Service........................................................... 5-4
Accessories and Modifications......................... 5-4
California Perchlorate Materials Requirements . . . 5-5
California Proposition 65 Warning.................... 5-5
Doing Your Own Work................................... 5-6
Engine Fan Breakage.................................... 5-6
Engine Soon Light.......................................3-36
Publications Ordering Information...................7-10
Transmission Warning Light..........................3-31
Servicing Your Airbag-Equipped Vehicle..............1-59
Sheet Metal Damage.......................................5-99
Signals, Turn and Lane-Change.......................... 3-8
Sliding Rear Windows....................................... 2-9
Snow Plow....................................................4-23
10