Fuel
Top Tier Fuel
GM recommends the use of TOP TIER Detergent Gasoline to keep the engine clean, reduce engine deposits, and maintain optimal vehicle performance. Look for the
Driving and Operating 285
TOP TIER Logo or see www.toptiergas.com for a list of TOP TIER Detergent Gasoline marketers and applicable countries.
Recommended Fuel (5.3L Engine)
For diesel engine vehicles, see “Fuel for Diesel Engines” in the Duramax diesel supplement.
Regular unleaded gasoline meeting ASTM specification D4814 with a posted octane rating (R+M)/2 of 87 or greater is recommended. Do not use gasoline with a posted octane rating of less than 87, as this will result in reduced performance and driveability. If heavy knocking is heard when using gasoline rated at 87 or greater, the engine needs service. Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with ethanol levels greater than 15% by volume.
Recommended Fuel (6.2L Engine)
For diesel engine vehicles, see “Fuel for Diesel Engines” in the Duramax diesel supplement.
Premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating (R+M)/2 of 91 or greater is recommended. If unavailable, unleaded gasoline with a posted octane rating of 87 may be used, but will result in reduced
performance and driveability. If heavy knocking is heard when using gasoline rated at 91 or greater, the engine needs service. Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with ethanol levels greater than 15% by volume.
Prohibited Fuels Caution
Do not use fuels with any of the following conditions; doing so may damage the vehicle and void its warranty: . For vehicles that are not FlexFuel, fuel
labeled greater than 15% ethanol by volume, such as mid-level ethanol blends (16–50% ethanol), E85, or FlexFuel.
. Fuel with any amount of methanol, methylal, ferrocene, and aniline. These fuels can corrode metal fuel system parts or damage plastic and rubber parts.
286 Driving and Operating Caution (Continued)
. Fuel containing metals such as methylcyclopentadienyl manganese tricarbonyl (MMT), which can damage the emissions control system and spark plugs.
. Fuel with a posted octane rating of less than the recommended fuel. Using this fuel will lower fuel economy and performance, and may decrease the life of the emissions catalyst.
Fuels in Foreign Countries
The U.S., Canada, and Mexico post fuel octane ratings in anti-knock index (AKI). For fuel not to use in a foreign country, see Prohibited Fuels 0 285.
Fuel Additives
TOP TIER Detergent Gasoline is highly recommended for use with your vehicle. If your country does not have TOP TIER Detergent Gasoline, add ACDelco Fuel System Treatment Plus−Gasoline to the vehicle’s gasoline fuel tank at every oil change or 15 000 km (9,000 mi), whichever occurs first. TOP TIER Detergent Gasoline and ACDelco Fuel System Treatment Plus
−Gasoline will help keep your vehicle’s engine fuel deposit free and performing optimally.
Filling the Tank
If the vehicle has a diesel engine, see the Duramax diesel supplement. An arrow on the fuel gauge indicates which side of the vehicle the fuel door is on. See Fuel Gauge 0 107.
Warning
Fuel vapors and fuel fires burn violently and can cause injury or death. Follow these guidelines to help avoid injuries to you and others: . Read and follow all the instructions on
the fuel pump island. . Turn off the engine when refueling. . Keep sparks, flames, and smoking
materials away from fuel. . Do not leave the fuel pump
unattended. . Avoid using electronic devices while
refueling. (Continued)
. Do not re-enter the vehicle while
pumping fuel. . Keep children away from the fuel
pump and never let children pump fuel.
. Before touching the fill nozzle, touch a metallic object to discharge static electricity from your body.
. Fuel can spray out if the fill nozzle is inserted too quickly. This spray can happen if the tank is nearly full, and is more likely in hot weather. Insert the fill nozzle slowly and wait for any hiss noise to stop before beginning to flow fuel.
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To open the fuel door, push and release the rearward center edge of the door. The capless refueling system does not have a fuel cap. Slowly and fully insert and latch the fill nozzle.
Warning
Overfilling the fuel tank by more than three clicks of a standard fill nozzle may cause: . Vehicle performance issues, including
engine stalling and damage to the fuel system.
. Fuel spills.
. Potential fuel fires.
Be careful not to spill fuel. Wait five seconds after you have finished pumping before removing the nozzle. Clean fuel from painted surfaces as soon as possible. See Exterior Care 0 390.
Warning
If a fire starts while you are refueling, do not remove the nozzle. Shut off the flow of fuel by shutting off the pump or by notifying the station attendant. Leave the area immediately.
Filling the Tank with a Portable Gas Can
If the vehicle runs out of fuel and must be filled from a portable gas can:
1. Locate the capless funnel adapter. 2. Insert and latch the funnel into the
capless fuel system.
Warning
Attempting to refuel without using the funnel adapter may cause fuel spillage and damage the capless fuel system. This could cause a fire and you or others could be badly burned and the vehicle could be damaged.
3. Remove and clean the funnel adapter and return it to the storage location.
Filling a Portable Fuel Container
Warning
Never fill a portable fuel container while it is in the vehicle. Static electricity discharge from the container can ignite the fuel vapor. You or others could be badly burned and the vehicle could be damaged. To help avoid injury to you and others: . Dispense fuel only into approved
containers. (Continued)
288 Driving and Operating
. Do not fill a container while it is
inside a vehicle, in a vehicle's trunk, in a pickup bed, or on any surface other than the ground.
. Bring the fill nozzle in contact with the inside of the fill opening before operating the nozzle. Maintain contact until filling is complete.
. Keep sparks, flames, and smoking materials away from fuel.
. Avoid using electronic devices while pumping fuel.
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