2007 GMC YUKON XL fuel additives

Service.........................................................426
Accessories and Modications....................426
California Proposition 65 Warning...............427
Doing Your Own Service Work...................427
Adding Equipment to the Outside of
Your Vehicle...........................................428
Fuel..............................................................428
Gasoline Octane........................................428
Gasoline Specications...............................428
California Fuel............................................429
Additives....................................................429
Fuel E85 (85% Ethanol).............................430
Fuels in Foreign Countries.........................431
Filling the Tank..........................................432
Filling a Portable Fuel Container................434
Checking Things Under the Hood..............434
Hood Release............................................435
Engine Compartment Overview...................436
Engine Oil..................................................438
Engine Oil Life System...............................441
Engine Air Cleaner/Filter.............................443
Automatic Transmission Fluid.....................445
Engine Coolant...........................................449Coolant Surge Tank Pressure Cap.............451
Engine Overheating....................................452
Overheated Engine Protection
Operating Mode......................................454
Cooling System..........................................455
Engine Fan Noise......................................460
Power Steering Fluid..................................461
Windshield Washer Fluid............................462
Brakes.......................................................463
Battery.......................................................466
Jump Starting.............................................467
Rear Axle.....................................................472
Four-Wheel Drive.........................................473
Front Axle....................................................474
Headlamp Aiming........................................475
Bulb Replacement........................................478
Halogen Bulbs............................................478
Taillamps, Turn Signal, Stoplamps and
Back-up Lamps.......................................478
License Plate Lamp....................................480
Replacement Bulbs....................................481
Section 5 Service and Appearance Care
423

Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your
vehicle can affect the airow around it. This may
cause wind noise and affect windshield washer
performance. Check with your dealer before
adding equipment to the outside of your vehicle.
Fuel
The 8th digit of your vehicle identication number
(VIN) shows the code letter or number that
identies your engine. You will nd the VIN at the
top left of the instrument panel. SeeVehicle
Identication Number (VIN) on page 538.
If your vehicle has the 5.3L V8 engine
(VIN Code 0) or the 5.3L V8 engine (VIN Code 3),
you may use either regular unleaded gasoline
or ethanol fuel containing up to 85% ethanol (E85);
also seeFuel E85 (85% Ethanol) on page 430.
In all other engines, use only regular unleaded
gasoline.
Gasoline Octane
Use regular unleaded gasoline with a posted
octane rating of 87 or higher. If the octane rating
is less than 87, you may notice an audible
knocking noise when you drive, commonly referred
to as spark knock. If this occurs, use a gasoline
rated at 87 octane or higher as soon as possible.
If you are using gasoline rated at 87 octane or
higher and you hear heavy knocking, your engine
needs service.
Gasoline Specications
At a minimum, gasoline should meet ASTM
specication D 4814 in the United States or
CAN/CGSB-3.5 in Canada. Some gasolines may
contain an octane-enhancing additive called
methylcyclopentadienyl manganese tricarbonyl
(MMT). General Motors recommends against the
use of gasolines containing MMT. SeeAdditives
on page 429for additional information.
428

California Fuel
If your vehicle is certied to meet California
Emissions Standards, it is designed to operate on
fuels that meet California specications. See
the underhood emission control label. If this fuel is
not available in states adopting California
emissions standards, your vehicle will operate
satisfactorily on fuels meeting federal
specications, but emission control system
performance may be affected. The malfunction
indicator lamp may turn on and your vehicle may
fail a smog-check test. SeeMalfunction Indicator
Lamp on page 236. If this occurs, return to
your authorized GM dealer for diagnosis. If it is
determined that the condition is caused by the type
of fuel used, repairs may not be covered by
your warranty.
Additives
To provide cleaner air, all gasolines in the United
States are now required to contain additives
that will help prevent engine and fuel system
deposits from forming, allowing your emission
control system to work properly. In most cases,
you should not have to add anything to your fuel.
However, some gasolines contain only the
minimum amount of additive required to meet U.S.
Environmental Protection Agency regulations.
To help keep fuel injectors and intake valves clean,
or if your vehicle experiences problems due to
dirty injectors or valves, look for gasoline that is
advertised as TOP TIER Detergent Gasoline. Also,
your GM dealer has additives that will help
correct and prevent most deposit-related problems.
Gasolines containing oxygenates, such as ethers
and ethanol, and reformulated gasolines may be
available in your area. General Motors
recommends that you use these gasolines if they
comply with the specications described earlier.
429

Those stations that do have E85 should have a
label indicating ethanol content. Do not use the fuel
if the ethanol content isgreaterthan 85%.
At a minimum, E85 should meet ASTM
Specication D 5798.
To ensure quick starts in the wintertime, the
E85 fuel must be formulated properly for your
climate according to ASTM specication D 5798.
If you have trouble starting on E85, it may be
because your E85 fuel is not properly formulated
for your climate. If this happens, switching to
gasoline or adding gasoline to your fuel tank may
improve starting. For good starting and heater
efficiency below 32°F (0°C), the fuel mix in the fuel
tank should contain no more than 70% ethanol.
It is best not to alternate repeatedly between
gasoline and E85. If you do switch fuels, it is
recommended that you add as much fuel as
possible — do not add less than ve gallons
(18.9 L) when refueling. You should drive the
vehicle immediately after refueling for at least
ve miles (8 km).
E85 has less energy per gallon than gasoline, so
you will need to rell your fuel tank more often
when using E85 than when you are using gasoline.
Regular unleaded gasoline is recommendedwhen pulling a trailer. For payload capacity with
ethanol fuel, seeLoading Your Vehicle on
page 390.
Notice:Some additives are not compatible
with E85 fuel and may harm your fuel system.
Damage caused by additives would not be
covered by your new vehicle warranty. Do not
use additives with E85 fuel.
Notice:Your vehicle was not designed for
fuel that contains methanol. Do not use
fuel containing methanol. It can corrode metal
parts in your fuel system and also damage
the plastic and rubber parts. That damage
would not be covered under your warranty.
Fuels in Foreign Countries
If you plan on driving in another country outside the
United States or Canada, the proper fuel may be
hard to nd. Never use leaded gasoline or any other
fuel not recommended in the previous text on fuel.
Costly repairs caused by use of improper fuel would
not be covered by your warranty.
To check the fuel availability, ask an auto club, or
contact a major oil company that does business
in the country where you will be driving.
431

A
Accessories and Modications...................... 426
Accessory Power Outlet(s)........................... 208
Adding a Snow Plow or Similar Equipment...... 396
Adding Equipment to Your
Airbag-Equipped Vehicle........................... 105
Additives, Fuel............................................. 429
Add-On Electrical Equipment........................ 539
Adjustable Throttle and Brake Pedal............. 140
Air Cleaner/Filter, Engine.............................. 443
Air Conditioning....................................210, 213
Airbag
Passenger Status Indicator....................... 228
Readiness Light........................................ 227
Airbag Sensing and Diagnostic
Module (SDM).......................................... 583
Airbag System............................................... 90
Adding Equipment to Your
Airbag-Equipped Vehicle........................ 105
How Does an Airbag Restrain?................... 98
Passenger Sensing System....................... 100
Servicing Your Airbag-Equipped Vehicle...... 104
What Makes an Airbag Inate?................... 98Airbag System (cont.)
What Will You See After an
Airbag Inates?....................................... 99
When Should an Airbag Inate?.................. 96
Where Are the Airbags?.............................. 93
Antenna, Rear Side Window........................ 337
Antenna, XM™ Satellite Radio
Antenna System....................................... 337
Anti-Lock Brake System (ABS)..................... 345
Anti-Lock Brake, System Warning Light........ 233
Appearance Care......................................... 527
Aluminum or Chrome-Plated Wheels......... 534
Care of Safety Belts................................. 531
Chemical Paint Spotting............................ 536
Cleaning Exterior Lamps/Lenses............... 532
Cleaning the Inside of Your Vehicle........... 528
Fabric/Carpet............................................ 529
Finish Care............................................... 532
Finish Damage.......................................... 536
Instrument Panel, Vinyl, and Other
Plastic Surfaces..................................... 531
Leather..................................................... 530
Sheet Metal Damage................................ 535
Tires......................................................... 535
Underbody Maintenance............................ 536
593

F
Filter
Engine Air Cleaner.................................... 443
Finish Damage............................................. 536
Flashers, Hazard Warning............................ 188
Flash-to-Pass............................................... 192
Flat Tire....................................................... 507
Flat Tire, Changing....................................... 508
Flat Tire, Storing.......................................... 522
Fluid
Automatic Transmission............................. 445
Power Steering......................................... 461
Windshield Washer................................... 462
Fog Lamp Light............................................ 241
Fog Lamps................................................... 202
Four-Wheel Drive.................................146, 473
Front Axle.................................................... 474
Fuel............................................................. 428
Additives................................................... 429
California Fuel.......................................... 429
E85 (85% Ethanol)................................... 430
Filling a Portable Fuel Container............... 434
Filling Your Tank....................................... 432
Fuels in Foreign Countries........................ 431
Gage........................................................ 243Fuel (cont.)
Gasoline Octane....................................... 428
Gasoline Specications............................. 428
Low Warning Light.................................... 243
Fuses
Center Instrument Panel Fuse Block......... 542
Fuses and Circuit Breakers....................... 540
Instrument Panel Fuse Block.................... 540
Underhood Fuse Block.............................. 543
Windshield Wiper...................................... 539
G
Gage
Engine Coolant Temperature..................... 234
Fuel.......................................................... 243
Oil Pressure.............................................. 239
Speedometer............................................ 226
Tachometer............................................... 226
Voltmeter Gage......................................... 231
Garage Door Opener................................... 169
Gasoline
Octane...................................................... 428
Specications............................................ 428
Glove Box.................................................... 174
GM Mobility Reimbursement Program........... 577
598