2007 CADILLAC DTS PROFESSIONAL fuel additives

Service........................................................ 353
Accessories and Modications................... 353
California Proposition 65 Warning.............. 354
Doing Your Own Service Work.................. 354
Adding Equipment to the Outside of
Your Vehicle.......................................... 355
Fuel............................................................. 355
Gasoline Octane........................................ 356
Gasoline Specications.............................. 356
California Fuel........................................... 356
Additives................................................... 357
Fuels in Foreign Countries........................ 358
Filling the Tank......................................... 358
Filling a Portable Fuel Container............... 361
Checking Things Under the Hood.............. 362
Hood Release........................................... 363
Engine Compartment Overview.................. 364
Engine Oil................................................. 365
Engine Oil Life System.............................. 368
Engine Air Cleaner/Filter............................ 370
Automatic Transaxle Fluid......................... 372
Engine Coolant.......................................... 374
Coolant Surge Tank Pressure Cap............ 377
Engine Overheating................................... 377Overheated Engine Protection
Operating Mode..................................... 379
Cooling System......................................... 380
Power Steering Fluid................................. 385
Windshield Washer Fluid........................... 386
Brakes...................................................... 387
Battery...................................................... 390
Jump Starting............................................ 392
Headlamp Aiming........................................ 397
Bulb Replacement....................................... 400
High Intensity Discharge (HID) Lighting..... 400
Windshield Wiper Blade Replacement....... 400
Tires............................................................ 402
Tire Sidewall Labeling............................... 403
Tire Terminology and Denitions............... 408
Ination - Tire Pressure............................. 411
High-Speed Operation............................... 413
Tire Pressure Monitor System................... 414
Tire Inspection and Rotation...................... 418
When It Is Time for New Tires.................. 419
Buying New Tires...................................... 420
Different Size Tires and Wheels................ 422
Uniform Tire Quality Grading..................... 422
Section 5 Service and Appearance Care
351

Gasoline Octane
Use premium unleaded gasoline with a posted
octane rating of 91 or higher. You can also use
regular unleaded gasoline rated at 87 octane or
higher, but your vehicle’s acceleration could be
slightly reduced, and you might notice a slight
audible knocking noise, commonly referred to as
spark knock. If the octane is less than 87, you might
notice a heavy knocking noise when you drive. If
this occurs, use a gasoline rated at 87 octane or
higher as soon as possible. Otherwise, you could
damage the engine. 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 357for 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 234. 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.
356

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.
357

A
Accessories and Modications..................... 353
Adaptive Cruise Control............................... 179
Adding Equipment to Your
Airbag-Equipped Vehicle............................ 87
Additives, Fuel............................................ 357
Add-On Electrical Equipment....................... 451
Air Cleaner/Filter, Engine............................. 370
Air Conditioning........................................... 210
Airbag
Passenger Status Indicator....................... 227
Readiness Light....................................... 226
Airbag System............................................... 70
What Will You See After an
Airbag Inates?...................................... 80
When Should an Airbag Inate?................. 77
Where Are the Airbags?............................. 73
Airbag Systems
Adding Equipment to Your
Airbag-Equipped Vehicle......................... 87
How Does an Airbag Restrain?.................. 79
Passenger Sensing System....................... 81
Servicing Your Airbag-Equipped Vehicle..... 86
What Makes an Airbag Inate?.................. 79
Analog Clock............................................... 210
Antenna, Backglass..................................... 300Antenna, XM™ Satellite Radio Antenna
System.................................................... 300
Anti-Lock Brake System.............................. 307
Anti-Lock Brake, System Warning Light....... 230
Appearance Care
Aluminum or Chrome-Plated Wheels........ 446
Care of Safety Belts................................ 443
Chemical Paint Spotting........................... 448
Cleaning Exterior Lamps/Lenses.............. 444
Cleaning the Inside of Your Vehicle.......... 440
Fabric/Carpet........................................... 441
Finish Care.............................................. 444
Finish Damage......................................... 447
Instrument Panel, Vinyl, and
Other Plastic Surfaces.......................... 443
Leather.................................................... 442
Sheet Metal Damage............................... 447
Speaker Covers....................................... 443
Tires........................................................ 447
Underbody Maintenance........................... 448
Vehicle Care/Appearance Materials.......... 449
Washing Your Vehicle.............................. 444
Weatherstrips........................................... 444
Windshield and Wiper Blades................... 445
Wood Panels........................................... 443
Ashtray....................................................... 209
503

F
Filter
Engine Air Cleaner................................... 370
Finish Damage............................................ 447
Flashers, Hazard Warning........................... 164
Flash-to-Pass.............................................. 172
Flat Tire...................................................... 427
Flat Tire, Changing...................................... 428
Flat Tire, Storing......................................... 437
Floor Mats................................................... 156
Fluid
Power Steering........................................ 385
Windshield Washer.................................. 386
Fog Lamp
Fog .......................................................... 198
Fog Lamp Light........................................... 238
Forward Collision Alert (FAC) System.......... 168
Fuel............................................................ 355
Additives.................................................. 357
California Fuel.......................................... 356
Filling a Portable Fuel Container.............. 361
Filling Your Tank...................................... 358
Fuels in Foreign Countries....................... 358Fuel (cont.)
Gage....................................................... 239
Gasoline Octane...................................... 356
Gasoline Specications............................ 356
Fuses
Fuses and Circuit Breakers...................... 452
Rear Underseat Fuse Block..................... 455
Underhood Fuse Block............................. 452
Windshield Wiper..................................... 451
G
Gage
Engine Coolant Temperature.................... 233
Fuel......................................................... 239
Speedometer........................................... 224
Tachometer.............................................. 224
Garage Door Opener................................... 144
Gasoline
Octane..................................................... 356
Specications........................................... 356
Glove Box................................................... 155
GM Mobility Reimbursement Program.......... 487
508