❑Air intake system service (or every 24 months,
whichever occurs first).(3) (4) (23)
❑Evaporative Control System service,
if equipped, (or every 24 months,
whichever occurs first).(2) (24) †
❑Gasoline Engine: Air compressor remote
mounted air filter dry element pleated paper
air strainer service (or every 6 months or
every 1800 hours, whichever occurs first).
96,000 Miles (152 000 km)
❑Isuzu 6H Diesel Without Engine Oil Life System
Only: Change engine oil and filter (or every
12 months, or every 600 hours of engine
operation, whichever occurs first).(2)
❑Isuzu 6H Diesel With Engine Oil Life System
Only: Check oil life system (or every 12 months,
or every 600 hours of engine operation,
whichever occurs first). If engine oil and filter
are changed, reset system. See “Engine Oil
(DURAMAX
®/Isuzu Diesel)” in the Index.(2) (7)
❑Lubricate U-joints (or every 6 months,
whichever occurs first).
97,500 Miles (156 000 km)
❑Gasoline Engine Only: Check engine oil life
system. If engine oil and filter are changed,
reset system. See “Engine Oil (Gasoline
Engine)” in the Index.(2) (8)
❑Check fluid levels (or every 3 months,
whichever occurs first).(1) (5)
❑Chassis lubrication service (or every 6 months,
whichever occurs first).(11)
❑Wheels and tires service.(14)
❑Hydraulic brake service (or every 6 months,
whichever occurs first).(6) (36)
❑Parking brake service (or every 6 months,
whichever occurs first).(21)
❑Air brake service (or every 6 months,
whichever occurs first).(32)
❑Air brake automatic slack adjuster service (or
every 500 hours, whichever occurs first).(33)
❑Check air brake relay valve operation and check
for leaks (or every month, or every 300 hours,
whichever occurs first).
381
(2)= An Emission Control Service.
(3)= A Noise Emission Control Device.
(4)= Applies to vehicles sold in the United States
and is recommended for vehicles sold in Canada.
(5)= Check fluid level in brake master cylinder,
power steering pump, front and rear axles,
transmission, and hydraulic spring parking brake
pump (if equipped). A low fluid level in the
brake master cylinder can indicate worn brake
linings and should be checked accordingly.
(6)= Inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chafing, etc.
Inspect disc brake pads for wear and rotors for
surface condition. Inspect caliper assemblies.
Check brake pedal for excessive free play or
travel (or every 6 months, whichever occurs first)
and have serviced if needed. Check brakes
more often if driving habits and conditions result
in frequent braking.(7)= This vehicle has the Engine Oil Life System.
This system will show you when to change the
engine oil and filter — usually between 3,000 miles
(5 000 km) and 12,000 miles (20 000 km) since
your last oil change. Under severe conditions,
the indicator may come on before 3,000 miles
(5 000 km). Never drive your 7.8L diesel engine
vehicle more than 12,000 miles (20 000 km),
or 12 months, or 600 engine hours, without an
oil and filter change.
Remember to reset the Engine Oil Life System
whenever the oil is changed. For more information,
seeEngine Oil Life System (Gasoline Engine)
on page 276orEngine Oil Life System
(DURAMAX
®Diesel) on page 278orEngine
Oil Life System (Caterpillar®Diesel Engine)
on page 279.
384
(8)= This vehicle has the Engine Oil Life System.
This system will show you when to change the
engine oil and filter — usually between 3,000 miles
(5 000 km) and 7,500 miles (12 000 km) since
your last oil change. Under severe conditions,
the indicator may come on before 3,000 miles
(5 000 km). Never drive your gasoline engine
vehicle more than 7,500 miles (12 000 km) or
12 months without an oil and filter change.
Remember to reset the Engine Oil Life System
whenever the oil is changed. For more information,
seeEngine Oil Life System (Gasoline Engine)
on page 276orEngine Oil Life System
(DURAMAX
®Diesel) on page 278orEngine
Oil Life System (Caterpillar®Diesel Engine)
on page 279.(9)= This vehicle has the Engine Oil Life System.
This system will show you when to change the
engine oil and filter — usually between 3,000 miles
(5 000 km) and 15,000 miles (24 000 km) since
your last oil change. Under severe conditions,
the indicator may come on before 3,000 miles
(5 000 km). Never drive your 6.6L diesel engine
vehicle more than 15,000 miles (24 000 km),
or 12 months, or 750 engine hours, without an
oil and filter change.
Remember to reset the Engine Oil Life System
whenever the oil is changed. For more information,
seeEngine Oil Life System (Gasoline Engine)
on page 276orEngine Oil Life System
(DURAMAX®Diesel) on page 278orEngine
Oil Life System (Caterpillar®Diesel Engine)
on page 279.
(10)= Inspect rear axle air shift motor for fluid
leaks. Remove plug to check fluid level. Inspect
air lines and hoses for proper hook-up, binding,
leaks, etc. Inspect at 1,000 miles (1 600 km)
and 22,500 miles (36 000 km) and then every
22,500 miles (36 000 km) thereafter.
385
(22)= Wheel bearing service:
•Grease type — Clean, inspect, and lubricate
with the proper wheel bearing grease at
designated intervals or when hubs are
removed. SeePart C: Recommended Fluids
and Lubricants on page 397.
•Oil-filled type — Some wheel bearings are
lubricated by axle lubricant. When you
have oil-filled hubs, use lubricant identical
to that used in the axle. Lubricant change
intervals are the same for front and rear
axles. However, you must maintain the proper
oil level between change intervals. See
Front Wheel Bearings with Oil-Filled Hubs
on page 319andPart C: Recommended
Fluids and Lubricants on page 397.
(23)= Check the air intake system installation
to see that gaskets are seated properly and
all hose connections, fasteners, and other
components are tight. Tighten connections
and fasteners or replace parts as required.(24)= Evaporative Control System Service,
if equipped: Check all fuel and vapor lines and
hoses for proper connections and correct routing
(or every 24 months, whichever occurs first).
Replace parts as needed.
(25)= Replace spark plugs. Inspect wires for
damage. Check the wire boot and boot heat
shield fit at spark plugs and coil. Replace parts
as needed.
(26)= Check the fuel tank, fuel cap and fuel lines
for damage which could cause leakage. Inspect
fuel cap for correct sealing ability and any
indications of damage. Check fuel cap gasket
for even filler neck imprint. Replace parts as
needed.
(27)= Check Exhaust Gas Recirculation (EGR)
system as described in the service manual.
SeeService Publications Ordering Information
on page 415.
388
Part B: Owner Checks and Services
Listed in this part are owner checks and services
which should be performed at the intervals
specified to help ensure the safety, dependability
and emission control performance of your
vehicle.
For your safety and that of others, any of the
safety-related components that may have been
damaged in an accident should be checked
and any needed repairs made before operating
the vehicle.
At the minimum, these routine checks should be
made every 6 months or 6,000 miles (10 000 km),
whichever occurs first. Whenever repairs are
needed, have them completed before operating
the vehicle.
At Each Fuel Fill
It is important for you or a service station attendant
to perform these underhood checks at each fuel ll.
Engine Oil Level Check
Check the engine oil level and add the proper
oil if necessary. SeeEngine Oil (Caterpillar®
Diesel Engine) on page 268orEngine Oil
(Gasoline Engine) on page 268orEngine Oil
(DURAMAX
®/Isuzu Diesel Engine) on page 272.
Engine Coolant Level Check
Check the engine coolant level and add
DEX-COOL®coolant mixture if necessary. See
Engine Coolant (Gas and DURAMAX®/Isuzu
Engines) on page 284orEngine Coolant
(Caterpillar
®Diesel Engines) on page 287.
Windshield Washer Fluid Level Check
Check the windshield washer fluid level in the
windshield washer fluid reservoir and add
the proper fluid if necessary. SeeWindshield
Washer Fluid on page 296.
Tire In ation Check
Check tire inflation cold. Make sure the tires are
inflated to the correct pressures. SeeLoading Your
Vehicle on page 238andIn ation - Tire Pressure
on page 322.
391
Part C: Recommended Fluids
and Lubricants
Fluids and lubricants identified below by name,
part number, or specification may be obtained
from your dealer.
Usage Fluid/Lubricant
Engine Oil
(Gasoline
Engine)Engine oil which meets GM
Standard GM6094M and displays
the American Petroleum Institute
Certified for Gasoline Engines
starburst symbol. GM Goodwrench
®
oil meets all the requirements for
your vehicle. To determine the
proper viscosity for your vehicle’s
engine, see “Engine Oil” in the
Index.
Usage Fluid/Lubricant
Engine Oil
(DURAMAX
®/
Isuzu Diesel
Engines)Engine oil with the letters CJ-4
or CI-4 is best for your vehicle.
The CJ-4 or CI-4 designation
may appear either alone or in
combination with other API
designations, such as API CJ-4/SM.
These letters show American
Petroleum Institute 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.
Engine Coolant
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine
coolant recommendations.
397
L
Lamps
Dome....................................................... 153
Exterior.................................................... 150
Marker..................................................... 152
Reading................................................... 154
LATCH System
Child Restraints......................................... 57
Light
Airbag Off................................................ 166
Airbag Readiness..................................... 165
Anti-Lock Brake System Warning............. 172
Brake System Warning............................. 169
Change Engine Oil................................... 176
Charging System..................................... 167
Check Gages Warning............................. 180
Daytime Running Lamps Indicator............ 179
Differential Lock Indicator......................... 178
Engine Overspeed Warning...................... 177
Engine Shutdown Warning....................... 177
Exhaust Brake Indicator........................... 178
Highbeam On.......................................... 179
Low Coolant Warning............................... 173
Low Oil Level........................................... 176
Low Washer Fluid Warning...................... 180
Malfunction Indicator................................ 174Light (cont.)
Range Inhibit Warning Indicator................ 169
Reduced Engine Power............................ 179
Safety Belt Reminder............................... 164
Safety Belt Reminder Tone...................... 164
Service Transmission Warning.................. 168
Trailer Anti-Lock Brake System Warning ... 172
Wait to Start Indicator.............................. 174
Water in Fuel Warning............................. 182
Lighting
Entry........................................................ 154
Loading Your Vehicle................................... 238
Locks
Door.......................................................... 91
Power Door............................................... 92
Loss of Control........................................... 221
Low Coolant Warning Light.......................... 173
Low Washer Fluid Warning Light................. 180
M
Maintenance, Normal Replacement Parts.... 352
Maintenance Schedule
At Each Fuel Fill...................................... 391
At Least Once a Year.............................. 396
At Least Twice a Year.............................. 392
How This Section is Organized................ 360
424
Maintenance Schedule (cont.)
Introduction.............................................. 360
Maintenance Requirements...................... 360
Part A - Scheduled Maintenance
Services............................................... 362
Part B - Owner Checks and Services....... 391
Part C - Recommended Fluids and
Lubricants............................................. 397
Part D - Maintenance Record.................. 400
Scheduled Maintenance........................... 363
Scheduled Maintenance Supplements...... 363
Using....................................................... 362
Your Vehicle and the Environment............ 360
Malfunction Indicator Light........................... 174
Manual Transmission
Fluid........................................................ 283
Operation................................................. 116
Manual Windows........................................... 93
Marker Lamps............................................. 152
Mirrors
Manual Rearview Mirror........................... 133
Outside Convex Mirrors............................ 134
Outside Heated Mirrors............................ 134
Outside Manual Mirrors............................ 133
Outside Power Mirrors............................. 133N
New Vehicle Break-In.................................... 95
Noise Control System, Tampering ................ 314
Normal Maintenance Replacement Parts..... 352
O
Odometer.................................................... 163
Odometer, Trip............................................ 163
Off-Road Recovery...................................... 219
Oil
Change Engine Oil Light.......................... 176
Engine............................................268, 272
Low Oil Level Light.................................. 176
Pressure Gage......................................... 175
Oil, Engine Oil Life System........276, 278, 279
Older Children, Restraints............................. 42
Other Service Items
Air Conditioning System........................... 320
Automatic Ether Injection System............. 318
Front Wheel Bearings with
Oil-Filled Hubs...................................... 319
Fuel Filter................................................ 317
425