Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
268 DRIVING AND OPERATING
reduced acceleration and fuel
economy. If knocking occurs, use a
gasoline rated at 93 octane as soon as
possible, otherwise, the engine could
be damaged. If heavy knocking is
heard when using gasoline with a
93 octane rating, 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.(Continued)
Caution (Continued)
.Fuel with any amount of
methanol, methylal, ferrocene,
and aniline. These fuels can
corrode metal fuel system parts
or damage plastic and rubber
parts.
.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, seeProhibited Fuels 0268.
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
An arrow on the fuel gauge indicates
which side of the vehicle the fuel door
is on. See Fuel Gauge 0102.
{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:
(Continued)
Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14584367) - 2021 - CRC - 10/14/20
INDEX 399
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
FluidAutomatic Transmission . . . . . . . . . 289
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 28
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
Front Pedestrian Braking (FPB)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Front Seats Heated and Ventilated . . . . . . . . . . . . 43
Front Storage . . . . . . . . . . . . . . . . . . . . . . . . 84
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Economy, Driving for Better . . . . . 205
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 270
Filling the Tank . . . . . . . . . . . . . . . . . . . 268
Foreign Countries . . . . . . . . . . . . . . . . . 268
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Low Fuel Warning Light . . . . . . . . . 112
Management, Active . . . . . . . . . . . . . . 225
Prohibited Fuels . . . . . . . . . . . . . . . . . . 268
Recommended . . . . . . . . . . . . . . . . . . . . 267
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 Fuses
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Fuses and Circuit Breakers . . . . . . . 303
Instrument Panel Fuse Block . . . . 306
G
Garage Door Opener . . . . . . . . . . . . . . . . 125 Programming . . . . . . . . . . . . . . . . . . . . . . 125
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . 300
Gauges Engine Coolant Temperature . . . . 103
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Speedometer . . . . . . . . . . . . . . . . . . . . . . 101
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 102
Trip Odometer . . . . . . . . . . . . . . . . . . . . 101
Warning Lights and Indicators . . . 99
Gear Shifting Light . . . . . . . . . . . . . . . . . 108
General Information Service and Maintenance . . . . . . . . 357
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . 282
Global Positioning System (GPS) . . . . . . . . . . . . . . . . . . . . . . 163
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 Guidance
Problems with the Route . . . . . . . . . 163
H
Hazard Warning Flashers . . . . . . . . . . 132
HD Radio Technology . . . . . . . . . . . . . . 144
Head Restraints . . . . . . . . . . . . . . . . . . . . . . 37
Head-up Display . . . . . . . . . . . . . . . . . . . . 116
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 131
Bulb Replacement . . . . . . . . . . . . . . . . 301
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . . . . . . 131
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . 131
High-Beam On Light . . . . . . . . . . . . . . 113
High/Low Beam Changer . . . . . . . . . 131
Lamps On Reminder . . . . . . . . . . . . . . 113
Heated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Steering Wheel . . . . . . . . . . . . . . . . . . . . . 91
Heated and Ventilated Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . 29
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
High-Beam On Light . . . . . . . . . . . . . . . . 113
