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Engine Oil Additives / Engine Oil
Flushes
Do not add anything to the oil. The recommended oilswith the starburst symbol that meet GM standards areall that is needed for good performance and engineprotection.
Engine oil system flushes are not recommended andcould cause engine damage not covered by the vehiclewarranty.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system that indicates whento change the engine oil and filter. This is based onengine revolutions and engine temperature, and not onmileage. Based on driving conditions, the mileage atwhich an oil change is indicated can vary considerably.For the oil life system to work properly, the system mustbe reset every time the oil is changed.
When the system has calculated that oil life has beendiminished, it indicates that an oil change is necessary.A CHANGE ENGINE OIL SOON message comes on.SeeDIC Warnings and Messageson page 4!48.Change the oil as soon as possible within the next600 miles (1 000 km). It is possible that, if driving underthe best conditions, the oil life system might not indicatethat an oil change is necessary for over a year.However, the engine oil and filter must be changed atleast once a year and at this time the system must bereset. Your dealer/retailer has trained service peoplewho will perform this work using genuine parts andreset the system. It is also important to check the oilregularly and keep it at the proper level.
If the system is ever reset accidentally, the oil must bechanged at 3,000 miles (5 000 km) since the last oilchange. Remember to reset the oil life systemwhenever the oil is changed.
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Page 477 of 616
Checking Coolant
The vehicle must be on a level surface when checkingthe coolant level.
Check to see if coolant is visible in the coolant surgetank. If the coolant inside the coolant surge tank isboiling, do not do anything else until it cools down.If coolant is visible but the coolant level is not at orabove the FULL COLD mark, add a 50/50 mixture ofclean, drinkable water and DEX-COOL®coolant at thecoolant surge tank, but be sure the cooling system iscool before this is done.
The coolant surge tank is located in the enginecompartment on the passenger side of the vehicle.SeeEngine Compartment Overviewon page 7!16formore information on location.
The coolant level should be at or above the FULLCOLD mark. If it is not, you may have a leak in thecooling system.
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Page 487 of 616

Checking Brake Fluid
Check brake fluid by looking at the brake fluid reservoir.SeeEngine Compartment Overview on page 7!16.
The fluid level should beabove MIN. If it is not,have the brake hydraulicsystem checked to see ifthere is a leak.
After work is done on the brake hydraulic system, makesure the level is above the MIN but not over theMAX mark.
What to Add
Use only new DOT 3 brake fluid from a sealedcontainer. SeeRecommended Fluids and Lubricantsonpage 8!10.
Always clean the brake fluid reservoir cap and the areaaround the cap before removing it. This helps keep dirtfrom entering the reservoir.
{WARNING:
With the wrong kind of fluid in the brake hydraulic
system, the brakes might not work well. This could
cause a crash. Always use the proper brake fluid.
Notice:
.Using the wrong fluid can badly damage
brake hydraulic system parts. For example,
just a few drops of mineral-based oil, such
as engine oil, in the brake hydraulic system
can damage brake hydraulic system parts so
badly that they will have to be replaced. Do
not let someone put in the wrong kind of
fluid.
.If brake fluid is spilled on the vehicle's
painted surfaces, the paint finish can be
damaged. Be careful not to spill brake fluid
on the vehicle. If you do, wash it off
immediately. SeeWashing Your Vehicleon
page 7!102.
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Page 558 of 616
FusesUsage
1Right Trailer Stop/Turn Lamp
2Electronic Stability SuspensionControl, Automatic Level ControlExhaust
3Left Trailer Stop/Turn Lamp
4Engine Controls
5Engine Control Module, ThrottleControl
6Trailer Brake Controller
7Front Washer
8Oxygen Sensors
9Antilock Brakes System 2
10Trailer Back-up Lamps
11Driver Side Low-Beam Headlamp
12Engine Control Module (Battery)
13Fuel Injectors, Ignition Coils(Right Side)
14Transmission Control Module(Battery)
15Vehicle Back-up Lamps
16Passenger Side Low-Beam Headlamp
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ApplicationCapacities
EnglishMetric
Transmission Fluid (Pan Removal and Replacement)6.0 qt5.7 L
Transfer Case Fluid1.5 qt1.4 L
Wheel Nut Torque140 lb ft190Y
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this manual.Recheck fluid after filling.†Oil filter should be changed at every oil change.
Engine Specifications
EngineVIN CodeTransmissionSpark Plug Gap
6.2L V8FAutomatic0.040 in (1.02 mm)
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Page 565 of 616

At your General Motors dealer/retailer, you can becertain that you will receive the highest level of serviceavailable. Your dealer/retailer has specially trainedservice technicians, uses genuine GM replacementparts, as well as, up to date tools and equipment toensure fast and accurate diagnostics.
The proper replacement parts, fluids, and lubricants touse are listed inRecommended Fluids and Lubricantson page 8!10andMaintenance Replacement Partsonpage 8!12. We recommend the use of genuine partsfrom your dealer/retailer.
Rotation of New Tires
To maintain ride, handling, and performance of thevehicle, it is important that the first rotation service fornew tires be performed when they have 8 000 to13 000 km (5,000 to 8,000 miles). SeeTire Inspectionand Rotation on page 7!71.
Scheduled Maintenance
When the Change Engine Oil Soon
Message Displays
Change engine oil and filter. SeeEngine Oilonpage 7!17.An Emission Control Service.
When the Change Engine Oil Soon message displays,service is required for the vehicle as soon as possible,within the next 1 000 km/600 miles. If driving under thebest conditions, the engine oil life system might notindicate the need for vehicle service for more than ayear. The engine oil and filter must be changed at leastonce a year and the oil life system must be reset. Yourdealer/retailer has trained service technicians who willperform this work and reset the system. If the engine oillife system is reset accidentally, service the vehiclewithin 5 000 km/3,000 miles since the last service. Resetthe oil life system whenever the oil is changed. SeeEngine Oil Life System on page 7!20.
When the Change Engine Oil Soon message displays,certain services, checks, and inspections are required.
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Page 566 of 616

Every Engine Oil Change
.Change engine oil and filter. SeeEngine Oilonpage 7!17.An Emission Control Service.
.Engine coolant level check. SeeEngine Coolanton page 7!29.
.Windshield washer fluid level check. SeeWindshield Washer Fluid on page 7!39.
.Tire inflation check. SeeInflation - Tire Pressureon page 7!65.
.Tire wear inspection. SeeTire Inspection andRotation on page 7!71.
.Rotate tires. SeeTire Inspection and Rotationonpage 7!71.
.Fluids visual leak check (or every 12 months,whichever occurs first). A leak in any system mustbe repaired and the fluid level checked.
.Engine air cleaner filter inspection. SeeEngine AirCleaner/Filter on page 7!22.
.Brake system inspection (or every 12 months,whichever occurs first).
.Lubricate the front suspension, steering linkage,and parking brake cable guides. Control arm balljoints are maintenance!free.
.Steering and suspension inspection. Visualinspection for damaged, loose, or missing parts orsigns of wear.
.Engine cooling system inspection. Visualinspection of hoses, pipes, fittings, and clamps andreplacement, if needed.
.Windshield wiper blade inspection for wear,cracking, or contamination and windshield andwiper blade cleaning, if contaminated. SeeWindshield, Backglass, and Wiper Bladesonpage 7!104. Worn or damaged wiper bladereplacement. SeeWindshield Wiper BladeReplacement on page 7!57.
.Body hinges and latches, key lock cylinders, rearcompartment hinges, outer tailgate handle pivotpoints, and folding seat hardware lubrication. SeeRecommended Fluids and Lubricantsonpage 8!10. More frequent lubrication may berequired when vehicle is exposed to a corrosiveenvironment. Applying silicone grease onweatherstrips with a clean cloth makes them lastlonger, seal better, and not stick or squeak.
.Restraint system component check. SeeCheckingthe Restraint Systems on page 2!91.
.Automatic transmission fluid level check andadding fluid, if needed. SeeAutomaticTransmission Fluid on page 7!24.
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Additional Required Services
At Each Fuel Stop
.Engine oil level check. SeeEngine Oilonpage 7!17.
.Engine coolant level check. SeeEngine Coolanton page 7!29.
.Windshield washer fluid level check. SeeWindshield Washer Fluid on page 7!39.
Once a Month
.Tire inflation check. SeeInflation - Tire Pressureon page 7!65.
.Tire wear inspection. SeeTire Inspection andRotation on page 7!71.
Once a Year
.Starter switch check. SeeOwner Checks andServices on page 8!8.
.Parking brake and automatic transmission P (Park)mechanism check. SeeOwner Checks andServices on page 8!8.
.Automatic transmission shiftlock control systemcheck. SeeOwner Checks and Servicesonp a g e 8!8.
.Ignition transmission lock check. SeeOwnerChecks and Services on page 8!8.
.Engine cooling system and pressure cap pressurecheck. Radiator and air conditioning condenseroutside cleaning. SeeCooling Systemonpage 7!28.
.Exhaust system and nearby heat shieldsinspection for loose or damaged components.
.Accelerator pedal check for damage, high effort,or binding. Replace if needed.
.Hood and liftgate support gas strut inspection forsigns of wear, corrosion, cracks, loss of lubricant,or other damage. Check the hold open ability ofthe gas strut. If necessary, replace with genuineparts from your dealer/retailer.
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