Page 321 of 484
A. Engine Coolant Recovery Tank. SeeCooling System
on page 5-28.
B. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-24.
C. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-38.
D. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil on page 5-18.
E. Automatic Transmission Fluid Dipstick.
See “Checking the Fluid Level” under
Automatic Transmission Fluid on page 5-25.
F. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil on page 5-18.G. Radiator Pressure Cap. SeeRadiator Pressure Cap
on page 5-34.
H. Remote Negative (−) Terminal (Marked GND).
SeeJump Starting on page 5-43.
I. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-37.
J. Brake Master Cylinder Reservoir. See “Brake Fluid”
underBrakes on page 5-39.
K. Engine Compartment Fuse Block. SeeEngine
Compartment Fuse Block on page 5-119.
L. Battery. SeeBattery on page 5-42.
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Page 323 of 484
A. Engine Coolant Recovery Tank. SeeCooling System
on page 5-28.
B. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-24.
C. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-38.
D. Engine Oil Fill Cap (Under Engine Cover).
See “When to Add Engine Oil” underEngine
Oil on page 5-18.
E. Engine Oil Dipstick (Out of View). See “Checking
Engine Oil” underEngine Oil on page 5-18.
F. Automatic Transmission Fluid Dipstick.
See “Checking the Fluid Level” underAutomatic
Transmission Fluid on page 5-25.G. Radiator Pressure Cap. SeeRadiator Pressure Cap
on page 5-34.
H. Remote Negative (−) Terminal (Marked GND).
SeeJump Starting on page 5-43.
I. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-37.
J. Brake Master Cylinder Reservoir. See “Brake Fluid”
underBrakes on page 5-39.
K. Engine Compartment Fuse Block. SeeEngine
Compartment Fuse Block on page 5-119.
L. Battery. SeeBattery on page 5-42.
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Page 324 of 484

Engine Oil
Checking Engine Oil
It is a good idea to check the engine oil every time you
get fuel. In order to get an accurate reading, the oil
must be warm and the vehicle must be on level ground.
The engine oil dipstick handle is a yellow loop.
SeeEngine Compartment Overview on page 5-12
for the location of the engine oil dipstick.
1. Turn off the engine and give the oil several minutes
to drain back into the oil pan. If you do not do this,
the oil dipstick might not show the actual level.
2. Pull out the dipstick and clean it with a paper towel
or cloth, then push it back in all the way. Remove it
again, keeping the tip down, and check the level.
When to Add Engine Oil
If the oil is below the L mark for the L6 engine
or the cross-hatched area at the tip of the dipstick
for the V8 engine, add at least one quart/liter of the
recommended oil. This section explains what kind
of oil to use. For engine oil crankcase capacity, see
Capacities and Specifications on page 5-125. L6 Engine
V8 Engine
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Page 325 of 484
Notice:Do not add too much oil. If the engine
has so much oil that the oil level gets above the
cross-hatched area (F) that shows the proper
operating range for the L6 engine or above the
cross-hatched area for the V8 engine, the engine
could be damaged.SeeEngine Compartment Overview on page 5-12for
the location of the engine oil ll cap.
Add enough oil to put the level somewhere in the proper
operating range. Push the dipstick all the way back in
when you are through.
6.0L V8 (VIN Code H) Engine Only
Remove the engine cover to access the engine oil
ll cap:
1. Remove the screw in the center of the cover.
2. Remove the cover from the stud on the driver side.
3. Pull the cover up and off the bracket.
4. Reverse the steps to reinstall.
Except 6.0L V8
(VIN Code H) Engine
6.0L V8 (VIN Code H)
Engine
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Page 328 of 484

Substitute Engine Oil: When adding oil to maintain
engine oil level, oil meeting GM Standard GM4718M
might not be available. You can add substitute oil
designated SAE 5W-30 with the starburst symbol at all
temperatures. Substitute oil not meeting GM Standard
GM4718M should not be used for an oil change.
Cold Temperature Operation
Except Vehicles with 6.0L V8 (VIN Code H)
Engine
If in an area of extreme cold, where the temperature
falls below−20°F (−29°C), use either an SAE 5W-30
synthetic oil or an SAE 0W-30 engine oil. Both provide
easier cold starting for the engine at extremely low
temperatures. Always use an oil that meets the required
speci cation, GM6094M. See “What Kind of Engine Oil
to Use” for more information.
Engine Oil Additives / Engine Oil
Flushes
Do not add anything to the oil. The recommended oils
with the starburst symbol that meet GM standards are
all that is needed for good performance and engine
protection.
Engine oil system ushes are not recommended and
could cause engine damage not covered by the vehicle
warranty.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system that indicates when
to change the engine oil and lter. This is based on
engine revolutions and engine temperature, and not on
mileage. Based on driving conditions, the mileage at
which an oil change is indicated can vary considerably.
For the oil life system to work properly, the system
must be reset every time the oil is changed.
When the system has calculated that oil life has been
diminished, it indicates that an oil change is necessary.
A change engine oil light comes on, and, if the vehicle
has a Driver Information Center (DIC), a CHANGE
ENGINE OIL message comes on. SeeChange Engine
Oil Light on page 3-43andDIC Warnings and Messages
on page 3-51. Change the oil as soon as possible within
the next 600 miles (1 000 km). It is possible that, if 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 lter must be changed at
least once a year and at this time the system must be
reset. Your dealer/retailer has trained 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, the oil must be
changed at 3,000 miles (5 000 km) since the last oil
change. Remember to reset the oil life system whenever
the oil is changed.
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