Page 240 of 372
6.2 L V8 Engine (L99 Engine shown LS3 similar)
9-8 Vehicle Care
Page 241 of 372

A. Underhood Electrical Center.
SeeEngine Compartment
Fuse Block on page 9-42.
B. Engine Coolant Recovery Bottle
and Cap. SeeEngine Coolant
on page 9-19.
C. Engine Oil Dipstick. SeeEngine
Oil on page 9-10.
D. Engine Oil Fill Cap (Out of
View). SeeEngine Oil on
page 9-10.
E.Engine Cover on page 9-9.
F. Engine Cooling Fans (Out of
View). SeeCooling System
on page 9-17.
G. Power Steering Reservoir and
Cap (Under Engine Cover).
SeePower Steering Fluid
on page 9-25.H. Brake Master Cylinder and
Hydraulic Clutch (if equipped
with manual transmission)
Reservoir. SeeBrakes on
page 9-27orHydraulic Clutch
on page 9-15.
I. Remote Positive (+) Terminal.
SeeBattery on page 9-29.
J.Engine Air Cleaner/Filter on
page 9-16.
K. Windshield Washer Fluid
Reservoir. SeeWasher Fluid
on page 9-26.
L. Radiator Fill Cap. SeeEngine
Coolant on page 9-19.Engine Cover
3.6 L V6 Engine Cover
To remove:
1. Remove the engine oil fill
cap (B).
2. Lift the engine cover (A) to
disengage one front attachment
point.
3. Pull engine cover forward to
disengage from two rear tabs.
4. Reverse Steps 1 through 3 to
reinstall engine cover.
Vehicle Care 9-9
Page 242 of 372

6.2 L V8 Engine Cover
(L99 Engine shown
LS3 similar)
To remove:
1. Remove the engine oil fill
cap (A).
2. Lift the engine cover (B) to
disengage two front attachment
points.
3. Pull engine cover forward to
disengage from horizontal
rear attachments.
4. Reverse Steps 1 through 3 to
reinstall engine cover.
Engine Oil
Checking Engine Oil
It is a good idea to check the
engine oil level at each fuel fill.
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 9-6
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 this is not done,
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 cross-hatched
area at the tip of the dipstick,
add at least one liter/quart of the
recommended oil. This section
explains what kind of oil to use.
For engine oil crankcase capacity,
seeCapacities and Speci cations
on page 11-2.
Notice:Do not add too much oil.
If the engine has so much oil
that the oil level gets above the
cross-hatched area that shows
the proper operating range,
the engine could be damaged.
SeeEngine Compartment Overview
on page 9-6for the location of the
engine oil fill cap.
Add enough oil to put the level
somewhere in the proper operating
range. Push the dipstick all the
way back in when through.
9-10 Vehicle Care
Page 243 of 372

What Kind of Engine Oil to
Use (V6 Engine)
Look for three things:
•GM6094M
Use only an oil that meets GM
Standard GM6094M.
•SAE 5W-30
SAE 5W-30 is best for the
vehicle. These numbers on an
oil container show its viscosity,
or thickness. Do not use
other viscosity oils such
as SAE 20W-50.
•American Petroleum Institute
(API) starburst symbol
Oils meeting these requirements
should have the starburst symbol
on the container. This symbol
indicates that the oil has been
certified by the American
Petroleum Institute (API).Notice:Use only engine oil
identi ed as meeting GM Standard
GM6094M and showing the
American Petroleum Institute
Certi ed For Gasoline Engines
starburst symbol. Failure to use
the recommended oil can result
in engine damage not covered by
the vehicle warranty.
Cold Temperature Operation
If in an area of extreme cold,
where the temperature falls
below−29°C (−20°F), 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
specification, GM6094M.
Vehicle Care 9-11
Page 244 of 372

What Kind of Engine Oil to Use
(V8 Engines)
Look for three things:
•GM4718M
This vehicle’s engine requires a
special oil meeting GM Standard
GM4718M. Oils meeting this
standard may be identified as
synthetic. However, not all
synthetic oils will meet this GM
standard. Use only an oil that
meets GM Standard GM4718M.
Notice:Using oils that do not
have the GM4718M Standard
designation can cause engine
damage not covered by the
vehicle warranty.
•SAE 5W-30
SAE 5W-30 is best for the
vehicle. These numbers on an
oil container show its viscosity,
or thickness. Do not use
other viscosity oils such
as SAE 20W-50.
•American Petroleum Institute
(API) starburst symbol
Oils meeting these requirements
should have the starburst symbol
on the container. This symbol
indicates that the oil has been
certified by the American
Petroleum Institute (API).
This vehicle’s engine was filled at
the factory with a Mobil 1
®synthetic
oil meeting all requirements for
this vehicle.
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.
9-12 Vehicle Care
Page 245 of 372

Engine Oil Additives / Engine
Oil Flushes
Do not add anything to the oil.
The recommended oils with
the starburst symbol that meet
GM Standard GM6094M are all
that is needed for good performance
and engine protection.
Engine oil system flushes 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 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 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 SOON message comes on.
SeeEngine Oil Messages on
page 4-32. Change the oil as soon
as possible within the next 1 000 km
(600 miles). 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 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, the oil must be changed
at 5 000 km (3,000 miles) since the
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 the oil is
changed prior to a change engine oil
message being turned on, reset the
system.
After changing the engine oil, reset
the system:
1. Turn the ignition key to ON/RUN
with the engine off.
2. Fully press and release the
accelerator pedal three times
within five seconds.
If the CHANGE ENGINE OIL
SOON message is not on,
the system is reset.
If the CHANGE ENGINE OIL SOON
message comes on again and stays
on for 30 seconds at the next ignition
cycle, it did not reset. The system
needs to be reset again.
Vehicle Care 9-13
Page 246 of 372

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. Recycle
it by taking it to a place that collects
used oil.
Automatic Transmission
Fluid
How to Check Automatic
Transmission Fluid
It is not necessary to check
the transmission fluid level.
A transmission fluid leak is the
only reason for fluid loss. If a leak
occurs, take the vehicle to your
dealer/retailer service department
and have it repaired as soon as
possible.
There is a special procedure
for checking and changing the
transmission fluid. Because this
procedure is difficult, you should
have this done at your dealer/
retailer service department.Contact your dealer/retailer for
additional information or the
procedure can be found in the
service manual. To purchase a
service manual, seeService
Publications Ordering Information
on page 12-12.
Change the fluid and filter at the
intervals listed inScheduled
Maintenance on page 10-2, and
be sure to use the fluid listed
inRecommended Fluids and
Lubricants on page 10-7.
9-14 Vehicle Care
Page 247 of 372

Manual Transmission
Fluid
It is not necessary to check the
manual transmission fluid level.
A transmission fluid leak is the only
reason for fluid loss. If a leak occurs,
take the vehicle to your dealer/
retailer service department and
have it repaired as soon as possible.
SeeRecommended Fluids and
Lubricants on page 10-7for the
proper fluid to use.
Hydraulic Clutch
It is not necessary to regularly
check brake/clutch fluid unless
you suspect there is a leak in the
system. Adding fluid will not correct
a leak. A fluid loss in this system
could indicate a problem. Have the
system inspected and repaired.
When to Check and What
to Use
The brake/hydraulic clutch fluid
reservoir cap has this symbol
on it. The common hydraulic clutch
and brake master cylinder fluid
reservoir is filled with DOT 3 brake
fluid as indicated on the reservoir
cap. SeeEngine Compartment
Overview on page 9-6for reservoir
location.
How to Check and Add Fluid
Visually check the brake/clutch
fluid reservoir to make sure the
fluid level is at the MIN (minimum)
line on the side of the reservoir.
The brake/hydraulic clutch fluid
system should be closed and
sealed.
Do not remove the cap to check
the fluid level or to top-off the fluid
level. Remove the cap only when
necessary to add the proper fluid
until the level reaches the MIN line.
Vehicle Care 9-15