
Additives
To provide cleaner air, all gasolines in the United Statesare now required to contain additives that help preventengine and fuel system deposits from forming, allowingthe emission control system to work properly. In mostcases, nothing should have to be added to the fuel.However, some gasolines contain only the minimumamount of additive required to meet U.S. EnvironmentalProtection Agency regulations. To help keep fuelinjectors and intake valves clean, or if the vehicleexperiences problems due to dirty injectors or valves,look for gasoline that is advertised as TOP TIERDetergent Gasoline.
For customers who do not use TOP TIER DetergentGasoline regularly, one bottle of GM Fuel SystemTreatment PLUS, added to the fuel tank at every engineoil change, can help clean deposits from fuel injectorsand intake valves. GM Fuel System Treatment PLUS isthe only gasoline additive recommended by GeneralMotors.
Also, your dealer/retailer has additives that will helpcorrect and prevent most deposit!related problems.
Gasolines containing oxygenates, such as ethers andethanol, and reformulated gasolines might be availablein your area. We recommend that you use thesegasolines, if they comply with the specifications
described earlier. However, E85 (85% ethanol) andother fuels containing more than 10% ethanol mustnot be used in vehicles that were not designed forthose fuels.
Notice:This vehicle was not designed for fuel thatcontains methanol. Do not use fuel containingmethanol. It can corrode metal parts in the fuelsystem and also damage plastic and rubber parts.That damage would not be covered under thevehicle warranty.
Some gasolines that are not reformulated for lowemissions can contain an octane-enhancing additivecalled methylcyclopentadienyl manganese tricarbonyl(MMT); ask the attendant where you buy gasolinewhether the fuel contains MMT. We recommend againstthe use of such gasolines. Fuels containing MMT canreduce the life of spark plugs and the performance ofthe emission control system could be affected. Themalfunction indicator lamp might turn on. If this occurs,return to your dealer/retailer for service.
Fuel E85 (85% Ethanol)
This vehicle can use either unleaded gasoline or85% ethanol fuel (E85). We encourage the use ofE85 in vehicles that are designed to use it. The ethanolin E85 is a“renewable”fuel, meaning it is made fromrenewable sources such as corn and other crops.
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Many service stations will not have an 85% ethanol fuel(E85) pump available. The U.S. Department of Energyhas an alternative fuels website (www.eere.energy.gov/afdc/infrastructure/locator.html) that can help you findE85 fuel. Those stations that do have E85 should havea label indicating ethanol content. Do not use the fuel ifthe ethanol content is greater than 85%.
At a minimum, E85 should meet ASTM SpecificationD 5798. By definition, this means that fuel labeled E85will have an ethanol content between 70% and 85%.Filling the fuel tank with fuel mixtures that do not meetASTM specifications can affect driveability and couldcause the malfunction indicator lamp to come on.
To ensure quick starts in the wintertime, the E85 fuelmust be formulated properly for your climate accordingto ASTM specification D 5798. If you have troublestarting on E85, it could be because the E85 fuel is notproperly formulated for your climate. If this happens,switching to gasoline or adding gasoline to the fuel tankcan improve starting. For good starting and heaterefficiency below 0°C (32°F), the fuel mix in the fuel tankshould contain no more than 70% ethanol. It is best notto alternate repeatedly between gasoline and E85.If you do switch fuels, it is recommended that youadd as much fuel as possible—do not add less than11 L (three gallons) when refueling. You should drivethe vehicle immediately after refueling for at least11 km (seven miles) to allow the vehicle to adaptto the change in ethanol concentration.
E85 has less energy per gallon than gasoline, so youwill need to refill the fuel tank more often when usingE85 than when you are using gasoline. SeeFilling theTank on page 7!11.
Notice:Some additives are not compatible withE85 fuel and can harm the vehicle's fuel system.Do not add anything to E85. Damage caused byadditives would not be covered by the vehiclewarranty.
Notice:This vehicle was not designed for fuel thatcontains methanol. Do not use fuel containingmethanol. It can corrode metal parts in the fuelsystem and also damage plastic and rubber parts.That damage would not be covered under thevehicle warranty.
Fuels in Foreign Countries
If you plan on driving in another country outside theUnited States or Canada, the proper fuel might be hardto find. Never use leaded gasoline or any other fuel notrecommended in the previous text on fuel. Costlyrepairs caused by use of improper fuel would not becovered by the vehicle warranty.
To check the fuel availability, ask an auto club,or contact a major oil company that does business inthe country where you will be driving.
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What Kind of Engine Oil to Use
Look for three things:
.GM4718M
This vehicle's engine requires a special oil meetingGM Standard GM4718M. Oils meeting thisstandard may be identified as synthetic. However,not all synthetic oils will meet this GM standard.Use only an oil that meets GM StandardGM4718M.
Notice:Using oils that do not have the GM4718MStandard designation can cause engine damage notcovered by the vehicle warranty.
.SAE 5W-30
SAE 5W-30 is best for the vehicle. These numberson an oil container show its viscosity, or thickness.Do not use other viscosity oils such asSAE 20W-50.
.American Petroleum Institute (API) starburstsymbol
Oils meeting theserequirements should havethe starburst symbol onthe container. This symbolindicates that the oil hasbeen certified by theAmerican PetroleumInstitute (API).
This vehicle's engine was filled at the factory with aMobil 1®synthetic oil meeting all requirements for thisvehicle.
Substitute Engine Oil: When adding oil to maintainengine oil level, oil meeting GM Standard GM4718Mmight not be available. You can add substitute oildesignated SAE 5W-30 with the starburst symbol at alltemperatures. Substitute oil not meeting GM StandardGM4718M should not be used for an oil change.
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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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How to Reset the Engine Oil Life
System
The Engine Oil Life System calculates when to changethe engine oil and filter based on vehicle use.Whenever the oil is changed, reset the system so it cancalculate when the next oil change is required. If asituation occurs where the oil is changed prior to aCHANGE ENGINE OIL SOON message being turnedon, reset the system.
Always reset the engine oil life to 100% after every oilchange. It will not reset itself. To reset the Engine OilLife System:
1. Display the OIL LIFE REMAINING on the DIC.
2. Press and hold the SET/RESET button on the DICfor more than five seconds. The oil life will changeto 100%.
If the CHANGE ENGINE OIL SOON message comesback on when the vehicle is started, the Engine Oil LifeSystem has not reset. Repeat the procedure.
What to Do with Used Oil
Used engine oil contains certain elements that can beunhealthy for your skin and could even cause cancer.Do not let used oil stay on your skin for very long. Cleanyour skin and nails with soap and water, or a good handcleaner. Wash or properly dispose of clothing or ragscontaining used engine oil. See the manufacturer'swarnings about the use and disposal of oil products.
Used oil can be a threat to the environment. If youchange your own oil, be sure to drain all the oil from thefilter before disposal. Never dispose of oil by putting it inthe trash, pouring it on the ground, into sewers, or intostreams or bodies of water. Recycle it by taking it to aplace that collects used oil.
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Engine Air Cleaner/Filter
SeeEngine Compartment Overviewon page 7!16forthe location of the engine air cleaner/filter.
Inspect the air cleaner/filter every other oil change andreplace it at the first oil change after each 50,000 mile(80 000 km) interval. SeeScheduled Maintenanceonp a g e 8!3for more information. If driving on dusty/dirtyconditions, inspect the filter at each engine oil change.
How to Inspect the Engine Air Cleaner/
Filter
To inspect the air cleaner/filter, remove the engine aircleaner/filter from the vehicle by following Steps 1through 6. When the engine air cleaner/filter isremoved, lightly shake it to release loose dust and dirt.If the engine air cleaner/filter remains caked with dirt, anew filter is required. Never use compressed air toclean the filter.
Replacing the Engine Air Cleaner/Filter
1. Locate the air cleaner/filter assembly . SeeEngine CompartmentOverviewonpage 7!16.
2. Loosen the four screws on the cover of thehousing and lift up the cover.
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Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and theENGINE POWER IS REDUCED message is displayed,an overheat protection mode which alternates firinggroups of cylinders helps prevent engine damage. Inthis mode, you will notice a loss in power and engineperformance. This operating mode allows the vehicle tobe driven to a safe place in an emergency. Drivingextended miles (km) and/or towing a trailer in theoverheat protection mode should be avoided.
Notice:After driving in the overheated engineprotection operating mode, to avoid engine damage,allow the engine to cool before attempting anyrepair. The engine oil will be severely degraded.Repair the cause of coolant loss, change the oil andreset the oil life system. SeeEngine Oilonpage 7!17.
Engine Fan Noise
The vehicle has electric cooling fans. You might hearthe fans spinning at low speed during most everydaydriving. The fans can turn off if no cooling is required.Under heavy vehicle loading, trailer towing, and/or highoutside temperatures, or if you are operating the airconditioning system, the fans can change to high speedand you might hear an increase in fan noise. This isnormal and indicates that the cooling system isfunctioning properly. The fans change to low speedwhen additional cooling is no longer required.
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To clean:
1. Saturate a lint-free, clean white cloth with water orclub soda.
2. Wring the cloth to remove excess moisture.
3. Start on the outside edge of the soil and gently rubtoward the center. Continue cleaning, using a cleanarea of the cloth each time it becomes soiled.
4. Continue to gently rub the soiled area until thecleaning cloth remains clean.
5. If the soil is not completely removed, use a mildsoap solution and repeat the cleaning process thatwas used with plain water.
If any of the soil remains, a commercial fabric cleaner orspot lifter may be necessary. When a commercialupholstery cleaner or spot lifter is to be used, test asmall hidden area for colorfastness first. If the locallycleaned area gives any impression that a ring formationmay result, clean the entire surface.
After the cleaning process has been completed, a papertowel can be used to blot excess moisture from thefabric or carpet.
Leather
A soft cloth dampened with water can be used toremove dust. If a more thorough cleaning is necessary,a soft cloth dampened with a mild soap solution can beused. Allow the leather to dry naturally. Do not use heatto dry. Never use steam to clean leather. Never usespot lifters or spot removers on leather. Manycommercial leather cleaners and coatings that are soldto preserve and protect leather may permanentlychange the appearance and feel of the leather and arenot recommended. Do not use silicone or wax-basedproducts, or those containing organic solvents to cleanthe vehicle's interior because they can alter theappearance by increasing the gloss in a non-uniformmanner. Never use shoe polish on leather.
TEHAMA™Leather
The leather surface on the seat was not designed to beaggressively cleaned using any commercial product.Use a well wrung cloth dampened with water to removedust. Do not use a wet cloth or saturate the leathersurface with water. Allow the leather to dry naturally. If asoil occurs that cannot be completely removed, allow itto become part of the natural markings of the leather.The leather in the vehicle was designed to have anatural appearance and develop a more vintageappearance with use.
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