2007 GMC SIERRA fuel additives

Service........................................................ 486
Accessories and Modications................... 486
California Proposition 65 Warning.............. 487
Doing Your Own Service Work.................. 487
Adding Equipment to the Outside of
Your Vehicle.......................................... 488
Fuel............................................................. 488
Gasoline Octane........................................ 489
Gasoline Specications.............................. 489
California Fuel........................................... 489
Additives................................................... 490
Fuel E85 (85% Ethanol)............................ 491
Fuels in Foreign Countries........................ 492
Filling the Tank......................................... 493
Filling a Portable Fuel Container............... 495
Checking Things Under the Hood.............. 496
Hood Release........................................... 497
Engine Compartment Overview.................. 498
Engine Oil (Gasoline Engine).................... 500
Engine Oil Life System.............................. 503
Engine Air Cleaner/Filter
(Gasoline Engines)................................. 505Automatic Transmission Fluid.................... 508
Engine Coolant.......................................... 513
Coolant Surge Tank Pressure Cap............ 516
Engine Overheating................................... 516
Overheated Engine Protection Operating
Mode (V8 Engines Only)........................ 519
Cooling System......................................... 520
Engine Fan Noise..................................... 525
Power Steering Fluid................................. 526
Windshield Washer Fluid........................... 527
Brakes...................................................... 528
Battery...................................................... 531
Jump Starting............................................ 532
Rear Axle.................................................... 538
Four-Wheel Drive........................................ 539
Front Axle................................................... 541
Noise Control System................................. 542
Tampering with Noise Control System
Prohibited.............................................. 542
Section 5 Service and Appearance Care
483

Gasoline Octane
Use regular unleaded gasoline with a posted
octane rating of 87 or higher. If the octane rating
is less than 87, you might 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, the 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 490for additional information.
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 260. 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.
489

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 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.However, E85 (85% ethanol) and other fuels
containing more than 10% ethanol must not
be used in vehicles that were not designed for
those fuels.
Notice:Your vehicle was not designed for
fuel that contains methanol. Do not use
fuel containing methanol. It can corrode metal
parts in the fuel system and also damage
plastic and rubber parts. That damage would
not be covered under your warranty.
Some gasolines that are not reformulated for low
emissions may contain an octane-enhancing
additive called methylcyclopentadienyl manganese
tricarbonyl (MMT); ask the attendant where you
buy gasoline whether the fuel contains MMT.
General Motors recommends against the use of
such gasolines. Fuels containing MMT can reduce
the life of spark plugs and the performance of
the emission control system may be affected. The
malfunction indicator lamp may turn on. If this
occurs, return to your dealer for service.
490

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 could
be because the E85 fuel is not properly formulated
for your climate. If this happens, switching to
gasoline or adding gasoline to the fuel tank can
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 three gallons
(11 L) when refueling. You should drive the vehicle
immediately after refueling for at least seven miles
(11 km) to allow the vehicle to adapt to the
change in ethanol concentration.
E85 has less energy per gallon than gasoline, so
you will need to rell the fuel tank more often
when using E85 than when you are using gasoline.
SeeFilling the Tank on page 493.Notice:Some additives are not compatible
with E85 fuel and can harm your vehicle’s fuel
system. Damage caused by additives would
not be covered by your new vehicle warranty.
Notice:Your vehicle was not designed for
fuel that contains methanol. Do not use
fuel containing methanol. It can corrode metal
parts in the fuel system and also damage
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 might
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.
492

A
Accessories and Modications..................... 486
Adding a Snow Plow or Similar
Equipment................................................ 432
Adding Equipment to Your Airbag-Equipped
Vehicle..................................................... 102
Additives, Fuel............................................ 490
Add-On Electrical Equipment....................... 608
Adjustable Throttle and Brake Pedal............ 136
Air Cleaner/Filter, Engine............................. 505
Air Conditioning.........................234, 237, 238
Airbag
Off Light.................................................. 250
Passenger Status Indicator....................... 252
Readiness Light....................................... 250
Airbag Sensing and Diagnostic
Module (SDM).......................................... 656
Airbag System............................................... 83
What Will You See After an Airbag
Inates?................................................. 92
When Should an Airbag Inate?................. 89
Where Are the Airbags?............................. 86
Airbag Systems
Adding Equipment to Your
Airbag-Equipped Vehicle....................... 102
Airbag Off Switch....................................... 93Airbag Systems (cont.)
How Does an Airbag Restrain?.................. 91
Passenger Sensing System....................... 97
Servicing Your Airbag-Equipped Vehicle.... 102
What Makes an Airbag Inate?.................. 91
AM-FM Radio.............................................. 304
Antenna, Fixed Mast................................... 371
Antenna, XM™ Satellite Radio Antenna
System.................................................... 371
Anti-Lock Brake System.............................. 379
Anti-Lock Brake, System Warning Light....... 257
Appearance Care
Aluminum or Chrome-Plated Wheels........ 603
Care of Safety Belts................................ 601
Chemical Paint Spotting........................... 605
Cleaning Exterior Lamps/Lenses.............. 602
Cleaning the Inside of Your Vehicle.......... 597
Fabric/Carpet........................................... 599
Finish Care.............................................. 602
Finish Damage......................................... 605
Instrument Panel, Vinyl, and Other
Plastic Surfaces.................................... 600
Leather.................................................... 600
Sheet Metal Damage............................... 604
Tires........................................................ 604
Underbody Maintenance........................... 605
Vehicle Care/Appearance Materials.......... 606
665

Event Data Recorders (EDR)...................... 656
Exit Lighting................................................ 226
Extender, Safety Belt..................................... 44
Exterior Lamps............................................ 221
F
Filter
Engine Air Cleaner................................... 505
Finish Damage............................................ 605
Fixed Mast Antenna.................................... 371
Flashers, Hazard Warning........................... 211
Flash-to-Pass.............................................. 214
Flat Tire...................................................... 576
Flat Tire, Changing...................................... 576
Flat Tire, Storing......................................... 592
Fluid
Automatic Transmission............................ 508
Power Steering........................................ 526
Windshield Washer.................................. 527
Fog Lamp
Fog .......................................................... 224
Fog Lamp Light........................................... 265
Four-Wheel Drive...............................147, 539
Four-Wheel-Drive Light................................ 265
Front Axle................................................... 541Fuel............................................................ 488
Additives.................................................. 490
California Fuel.......................................... 489
E85 (85% Ethanol)................................... 491
Filling a Portable Fuel Container.............. 495
Filling Your Tank...................................... 493
Fuels in Foreign Countries....................... 492
Gage....................................................... 266
Gasoline Octane...................................... 489
Gasoline Specications............................ 489
Low Warning Light................................... 267
Fuses
Center Instrument Panel Fuse Block........ 611
Fuses and Circuit Breakers...................... 608
Instrument Panel Fuse Block................... 609
Underhood Fuse Block............................. 612
Windshield Wiper..................................... 608
G
Gage
Engine Coolant Temperature.................... 258
Fuel......................................................... 266
Oil Pressure............................................. 263
Speedometer........................................... 248
670