2020 GMC YUKON oil additives

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
Driving and Operating 255
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.
(Continued)
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 0255.
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.
E85 or FlexFuel
Vehicles with a yellow fuel sticker
on the fuel door can use either
unleaded gasoline or fuel containing
up to 85% ethanol (E85). All other
vehicles should use only the
unleaded gasoline as described in
Recommended Fuel (L83 5.3L
V8 Engine) 0254 or
Recommended Fuel (L86 6.2L
V8 Engine) 0254.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
Vehicle Care 291
Caution
Failure to use the recommended
engine oil or equivalent can result
in engine damage not covered by
the vehicle warranty.
Viscosity Grade
Use SAE 0W-20 viscosity grade
engine oil.
When selecting an oil of the
appropriate viscosity grade, it is
recommended to select an oil of the
correct specification. See
“Specification” earlier in this section.
Engine Oil Additives/Engine
Oil Flushes
Do not add anything to the oil. The
recommended oils meeting the
dexos1 specification are all that is
needed for good performance and
engine protection.
Engine oil system flushes are not
recommended and could cause
engine damage not covered by the
vehicle warranty.
What to Do with Used Oil
Used engine oil contains certain
elements that can be unhealthy for
your skin and could even cause
cancer. Do not let used oil stay on
your skin for very long. Clean your
skin and nails with soap and water,
or a good hand cleaner. Wash or
properly dispose of clothing or rags
containing used engine oil. See the
manufacturer's warnings about the
use and disposal of oil products.
Used oil can be a threat to the
environment. If you change your
own oil, be sure to drain all the oil
from the filter before disposal. Never dispose of oil by putting it in the
trash or pouring it on the ground,
into sewers, or into streams or
bodies of water. Recycle it by taking
it to a place that collects used oil.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system
that indicates when to change the
engine oil and filter. This is based
on a combination of factors which
include engine revolutions, engine
temperature, and miles driven.
Based on driving conditions, the
mileage at which an oil change is
indicated can vary considerably. For
the oil life system to work properly,
the system must be reset every time
the oil is changed.
When the system has calculated
that oil life has been diminished, a
CHANGE ENGINE OIL SOON
message comes on to indicate that
an oil change is necessary. Change
the oil as soon as possible within
the next 1 000 km (600 mi). It is
possible that, if driving under the

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13566587) - 2020 - CRC - 4/15/19
Index 425
Fluid (cont'd)Four-Wheel Drive
Transfer Case . . . . . . . . . . . . . . . 219
Washer . . . . . . . . . . . . . . . . . . . . . . . 302
Fog Lamps . . . . . . . . . . . . . . . . . . . . . 169 Bulb Replacement . . . . . . . . . . . . 312
Folding Mirrors . . . . . . . . . . . . . . . . . . 38
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . 245
Four-Wheel Drive . . . . . . . . . . 219, 305
Four-Wheel-Drive Light . . . . . . . . . 139
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . 405
Front Axle . . . . . . . . . . . . . . . . . . . . . . 306
Front Fog Lamp
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Front Seats Heated and Ventilated . . . . . . . . . . 54
Fuel Additives . . . . . . . . . . . . . . . . . . . . . 255
Economy, Driving for Better . . . 184
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . 258
Filling the Tank . . . . . . . . . . . . . . . 256
Foreign Countries . . . . . . . . . . . . 255
Gauge . . . . . . . . . . . . . . . . . . . . . . . . 130
Low Fuel Warning Light . . . . . . . 142
Management, Active . . . . . . . . . . .211 Fuel (cont'd)
Prohibited Fuels . . . . . . . . . . . . . . 255
Recommended . . . . . . . . . . . . . . . 254
Top Tier . . . . . . . . . . . . . . . . . . . . . . 254
Full-Size Spare Tire . . . . . . . . . . . . 359
Fuses Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 315
Fuses and Circuit Breakers . . . 315
Instrument Panel Fuse
Block . . . . . . . . . . . . . . . . . . . 320, 323
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 325
G
Garage Door Opener . . . . . . . . . . . 160Programming . . . . . . . . . . . . . . . . . 160
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . 310
Gauges Engine CoolantTemperature . . . . . . . . . . . . . . . . 131
Engine Oil Pressure . . . . . . . . . . 130
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Odometer . . . . . . . . . . . . . . . . . . . . . 129
Speedometer . . . . . . . . . . . . . . . . . 129
Tachometer . . . . . . . . . . . . . . . . . . . 129
Transmission Temperature . . . . 132
Trip Odometer . . . . . . . . . . . . . . . . 129 Gauges (cont'd)
Voltmeter . . . . . . . . . . . . . . . . . . . . . 133
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . 125
General Information Service and Maintenance . . . . . 377
Towing . . . . . . . . . . . . . . . . . . . . . . . . 259
Vehicle Care . . . . . . . . . . . . . . . . . . 282
Glass Replacement . . . . . . . . . . . . . 310
Glove Box . . . . . . . . . . . . . . . . . . . . . . 109
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . 399
H
Hazard Warning Flashers . . . . . . . 168
Head Restraints . . . . . . . . . . . . . . . . . 47
Head-up Display . . . . . . . . . . . . . . . . 147
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . 312
Automatic . . . . . . . . . . . . . . . . . . . . . 167
Bulb Replacement . . . . . . . . . . . . 312
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . 167
Flash-to-Pass . . . . . . . . . . . . . . . . . 167
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 312
High-Beam On Light . . . . . . . . . . 143
High/Low Beam Changer . . . . . 166