2018 MERCEDES-BENZ GLS SUV tire size

Average weight of the vehicle
occupants (definition) .................... 372
Bar (definition) ............................... 372
Changing a wheel .......................... 374
Characteristics .............................. 372
Checking ........................................ 354
Curb weight (definition) ................. 373
Definition of terms ......................... 372
Direction of rotation ...................... 375
Display message ............................ 273
Distribution of the vehicle occu-
pants (definition) ............................ 374
DOT (Department of Transporta-
tion) (definition) ............................. 372
DOT, Tire Identification Number
(TIN) ............................................... 371
GAWR (Gross Axle Weight Rating)
(definition) ..................................... 372
GTW (Gross Trailer Weight) (defi-
nition) ............................................ 373
GVW (Gross Vehicle Weight) (def-
inition) ........................................... 373
GVWR (Gross Vehicle Weight Rat-
ing) (definition) .............................. 373
Important safety notes .................. 354
Increased vehicle weight due to
optional equipment (definition) ...... 372
Information on driving .................... 354
Kilopascal (kPa) (definition) ........... 373
Labeling (overview) ........................ 369
Load bearing index (definition) ...... 374
Load index ..................................... 371
Load index (definition) ................... 373
M+S tires ....................................... 356
Maximum load on a tire (defini-
tion) ............................................... 373
Maximum loaded vehicle weight
(definition) ..................................... 373
Maximum permissible tire pres-
sure (definition) ............................. 373
Maximum tire load ......................... 371
Maximum tire load (definition) ....... 373
MOExtended tires .......................... 356
Optional equipment weight (defi-
nition) ............................................ 374
PSI (pounds per square inch)(de
f-
inition) ........................................... 373
Replacing ....................................... 374 Service life ..................................... 355
Sidewall (definition) ....................... 374
Snow chains .................................. 356
Speed rating (definition) ................ 373
Storing ........................................... 375
Structure and characteristics
(definition) ..................................... 372
Summer tires in winter .................. 356
Temperature .................................. 368
TIN (Tire Identification Number)
(definition) ..................................... 374
Tire bead (definition) ...................... 373
Tire pressure (definition) ................ 373
Tire pressures (recommended) ...... 372
Tire size (data) ............................... 379
Tire size designation, load-bearing
capacity, speed rating .................... 369
Tire tread ....................................... 355
Tire tread (definition) ..................... 373
Total load limit (definition) ............. 374
Traction ......................................... 368
Traction (definition) ....................... 374
Tread wear ..................................... 368
TWR (permissible trailer drawbar
noseweight) (definition) ................. 374
Uniform Tire Quality Grading
Standards ...................................... 367
Uniform Tire Quality Grading
Standards (definition) .................... 372
Wear indicator (definition) ............. 374
Wheel and tire combination ........... 379
Wheel rim (definition) .................... 372
see Flat tire
Tool
see Vehicle tool kit
Top Tether ............................................ 63
Tow-starting
Emergency engine starting ............ 352
Important safety notes .................. 349
Towing a trailer
Axle load, permissible .................... 395
Cleaning the trailer tow hitch ......... 335
Coupling up a trailer ...................... 227
Decoupling a trailer ....................... 229
Driving tips .................................... 225
Important safety notes .................. 224
Installing the ball coupling ............. 226
Lights displ ay me
ssage .................. 260
22Index

Parking .......................................... 161
Parking for a long period ................164
Pulling away ................................... 143
Raising ...........................................3 76
Reporting problems ......................... 31
Securing from rolling away ............ 375
Towing away .................................. 349
Transporting .................................. 351
Unlocking (in an emergency) ........... 84
Unlocking (SmartKey) ......................7 7
Vehicle data ................................... 392
Vehicle battery
see Battery (vehicle)
Vehicle data ....................................... 392
Vehicle data (off-road driving)
Approach/departure angle ............ 394
Fording depth ................................ 393
Maximum gradient climbing abil-
ity .................................................. 394
Vehicle dimensions ........................... 392
Vehicle emergency locking ................ 84
Vehicle identification number
see VIN
Vehicle identification plate .............. 385
Vehicle level
AIRMATIC ...................................... 190
Vehicle level (display message) ....... 265
Vehicle tool kit .................................. 339
Video
Operating the DVD .........................2 39
see also Digital Operator's Man-
ual ..................................................2 92
VIN ...................................................... 385
Seat ............................................... 386
Type plate ...................................... 385
W
Warning and indicator lamps ABS ................................................ 282
Brakes ...........................................2 81
Coolant .......................................... 288
Distance Pilot DISTRONIC ............. 290
Distance warning ........................... 290
Engine diagnostics ......................... 288
ESP
®.............................................. 284
ESP®OFF ....................................... 285
Fuel tank ........................................ 288 Overview .......................................... 37
Parking brake ................................ 287
PASSENGER AIR BAG ...................... 45
Reserve fuel ................................... 288
Restraint system ............................ 287
Seat belt ........................................ 280
Tire pressure monitor .................... 291
Warranty .............................................. 28
Washer fluid
Display message ............................ 278
Weather display (COMAND)
see also Digital Operator's Man-
ual .................................................. 292
Wheel and tire combinations
Tires ............................................... 379
Wheel bolt tightening torque ........... 378
Wheel chock ...................................... 375
Wheels
Changing a wheel .......................... 374
Checking ........................................ 354
Cleaning ......................................... 333
Emergency spare wheel ................. 380
Important safety notes .................. 354
Information on driving .................... 354
Interchanging/changing ................ 374
Mounting a new wheel ................... 377
Mounting a wheel .......................... 375
Overview ........................................ 354
Removing a wheel .......................... 377
Snow chains .................................. 356
Storing ........................................... 375
Tightening torque ........................... 378
Wheel size/tire size ....................... 379
Window curtain air bag
Display message ............................ 257
Operation ......................................... 51
Windows
see Side windows
Windshield
Defrosting ...................................... 133
Infrared reflective .......................... 324
Windshield washer fluid
see Windshield washer system
Windshield washer system
Adding washer fluid ....................... 329
Important safety notes .................. 391
Windshield wipers
Problem (malfunction) ................... 124
24Index

If ESP®detects that the vehicle is deviating from
the direction desired by the driver, one or more
wheels are braked to stabilize the vehicle. The
engine output is also modified to keep the vehi-
cle on the desired course within physical limits.
ESP
®assists the driver when pulling away on
wet or slippery roads. ESP®can also stabilize
the vehicle during braking.
ETS/4ETS (Electronic Traction System)
4ETS traction control is part of ESP®.
Traction control brakes the drive wheels indi-
vidually if they spin. This enables you to pull
away and accelerate on slippery surfaces, for
example if the road surface is slippery on one
side. In addition, more drive torque is transfer-
red to the wheel or wheels with traction.
Traction control remains active, even if you
deactivate ESP
®.
In appropriate driving situations, activate the
offroad program:
XVehicles without the Offroad Engineering
package (Ypage 219)
XVehicles with the Off-Road Engineering pack-
age (Ypage 220)
Off-road 4ETS (Electronic Traction Sys-
tem)
An ETS system specifically suited to off-road
terrain is activated automatically once an off-
road program is activated:
RVehicles without the Offroad Engineering
package (Ypage 219)
RVehicles with the Off-Road Engineering pack-
age (Ypage 220)
Important safety notes
GWARNING
If ESP
®is malfunctioning, ESP®is unable to
stabilize the vehicle. Additionally, further driv-
ing safety systems are deactivated. This
increases the risk of skidding and an accident.
Drive on carefully. Have ESP
®checked at a
qualified specialist workshop.
!Only operate the vehicle for a maximum of
ten seconds on a brake test dynamometer.
Switch off the ignition.
Application of the brakes by ESP
®may oth-
erwise destroy the brake system.
!A function or performance test should only
be carried out on a two-axle dynamometer.
Before you operate the vehicle on such a
dynamometer, please consult a qualified
workshop. You could otherwise damage the
drive train or the brake system.
ESP
®is only deactivated if the åwarning
lamp is lit continuously.
If the ÷ warning lamp and the åwarning
lamp are lit continuously, ESP
®is not available
due to a malfunction.
Observe the information on warning lamps
(
Ypage 284) and display messages which may
be shown in the instrument cluster
(
Ypage 249).
iOnly use wheels with the recommended tire
sizes. Only then will ESP®function properly.
Characteristics of ESP®
General information
If the ÷ ESP warning lamp goes out before
beginning the journey, ESP®is automatically
active.
If ESP
®intervenes, the ÷ESP®warning lamp
flashes in the instrument cluster.
If ESP
®intervenes:
XDo not deactivate ESP®under any circum-
stances.
XOnly depress the accelerator pedal as far as
necessary when pulling away.
XAdapt your driving style to suit the prevailing
road and weather conditions.
ECO start/stop function
The ECO start/stop function switches the
engine off automatically when the vehicle stops
moving. The engine starts automatically when
the driver wants to pull away again. ESP
®
remains in its previously selected status, e.g. if
ESP®was deactivated before the engine was
automatically switched off.
70Driving safety systems
Safety

XIf possible, bring the front wheels into the
straight-ahead position.
XVehicles with the AIRMATIC package:
make sure that the normal vehicle level is
selected (
Ypage 190).
XVehicles with the Off-Road Engineering
package:make sure that the normal level is
selected (
Ypage 184).
XSwitch off the engine.
XVehicles without KEYLESS-GO: remove the
SmartKey from the ignition lock.
XVehicles with KEYLESS-GO: open the driv-
er's door.
The vehicle electronics are now in position
u. This means no SmartKey is in the ignition
lock.
XVehicles with KEYLESS-GO: remove the
Start/Stop button from the ignition lock
(
Ypage 140).
XMake sure that the passengers are not endan-
gered as they do so. Make sure that no one is near the danger area while a wheel is being
changed. Anyone who is not directly assisting
in the wheel change should, for example,
stand behind the barrier.
XGet out of the vehicle. Pay attention to traffic
conditions when doing so.
XClose the driver's door.
XUnload heavy luggage.
iOnly operate the tire inflation compressor
using a 12 V socket, even if the ignition is
turned off (
Ypage 312).
An emergency cut-out ensures that the on-
board voltage does not drop too low. If the on-
board voltage is too low, the power to the
sockets is automatically cut. This ensures
that there is sufficient power to start the
engine.
MOExtended tires (tires with run-flat
properties)
General notes
With MOExtended tires (tires with run flat char-
acteristics), you can continue to drive your vehi-
cle even if there is a total loss of pressure in one
or more tires. The affected tire must not show
any clearly visible damage.
You can recognize a MOExtended tire by the
MOExtended marking which appears on the sidewall of the tire. You will find this marking
next to the tire size designation, the load-bear-
ing capacity and the speed index (
Ypage 369).
MOExtended tires may only be used in conjunc-
tion with an active tire pressure loss warning
system or with an active tire pressure monitor.
If a pressure loss warning message appears
in the multifunction display:
Robserve the instructions in the display mes-
sages (Ypage 273).
Rcheck the tire for damage
Rif driving on, observe the following notes
The driving distance possible in run-flat mode is
approximately 50 miles (80 km) when the vehi-
cle is partially laden and approximately 18 miles
(30 km) when the vehicle is fully laden.
In addition to the vehicle load, the driving dis-
tance possible depends upon:
RVehicle speed
RRoad condition
ROutside temperature
The driving distance possible in run-flat mode
may be reduced by extreme driving conditions
or maneuvers, or it can be increased through a
moderate style of driving.
The driving distance possible in run-flat mode is
counted from the moment the tire pressure loss
warning appears in the multifunction display.
You must not exceed a maximum permissible
speed of 50 mph (80 km/h).
iWhen replacing one or all tires, please
observe the following specifications for your
vehicle's tires:
Rsize
Rtype and
Rthe "MOExtended" mark
If a tire has gone flat and cannot be replaced with a MOExtended tire, a standard tire may
be used as a temporary measure. Make sure
that you use the proper size and type (sum-
mer or winter tire).
iVehicles equipped with MOExtended tires
are not equipped with a TIREFIT kit at the fac-
tory. It is therefore recommended that you
additionally equip your vehicle w

ith a TIREFIT
kit if you mount tires that do not feature run-
flat properties, e.g. winter tires. A TIREFIT kit
may be obtained from a qualified specialist
workshop.
340Flat tire
Breakdown assistance

Pay particular attention to damage such as:
RCuts in the tires
RPunctures in the tires
RTears in the tires
RBulges on tires
RDeformation or severe corrosion on wheels
Regularly check the tire tread depth and the
condition of the tread across the whole width of
all tires (
Ypage 355). If necessary, turn the
front wheels to full lock in order to inspect the
inner side of the tire surface.
All wheels must have a valve cap to protect the
valve against dirt and moisture. Do not mount
anything onto the valve other than the standard
valve cap or other valve caps approved by
Mercedes-Benz for your vehicle. Do not use any
other valve caps or systems, e.g. tire pressure
monitoring systems.
Regularly check the pressure of all the tires par-
ticularly prior to long trips. Adjust the tire pres-
sure as necessary (
Ypage 357).
Observe the notes on the emergency spare
wheel (
Ypage 380).
The service life of tires depends, among other
things, on the following factors:
RDriving style
RTire pressure
RDistance covered
Notes on tire tread
GWARNING
Insufficient tire tread will reduce tire traction.
The tire is no longer able to dissipate water.
This means that on wet road surfaces, the risk
of hydroplaning increases, in particular where speed is not adapted to suit the driving con-
ditions. There is a risk of accident.
If the tire pressure is too high or too low, tires
may exhibit different levels of wear at differ-
ent locations on the tire tread. Thus, you
should regularly check the tread depth and
the condition of the tread across the entire
width of all tires.
Minimum tire tread depth for:
RSummer tires: âin (3 mm)
RM+S tires: ãin (4 mm)
For safety reasons, replace the tires before
the legally prescribed limit for the minimum
tire tread depth is reached.
Marking :shows where the bar indicator
(arrow) for tread wear is integrated into the tire
tread.
Treadwear indicators (TWI) are required by law. Six indicators are positioned on the tire tread.
They are visible once a tread depth of approx-
imately áin (1.6 mm) has been reached. If this
is the case, the tire is so worn that it must be
replaced.
Selecting, mounting and replacing
tires
ROnly mount tires and wheels of the same type
and make.
Exception: it is permissible to mount a differ-
ent type or make in the event of a flat tire.
Observe here the "MOExtended tires (tires
with run-flat characteristics)" section
(
Ypage 340).
ROnly mount tires of the correct size onto the
wheels.
RBreak in new tires at moderate speeds for the first 60 miles (100 km). The new tires only
reach their full performance after this dis-
tance.
RDo not drive with tires which have too little
tread depth. This significantly reduces the
traction on wet roads (hydroplaning).
RReplace the tires after six years at the latest,
regardless of wear.
Observe the notes on the emergency spare
wheel (
Ypage 380).
Operation355
Wheels and tires
Z

Rincorrectly set tire pressure
Rsudden loss of tire pressure, e.g. from a for-
eign object that has penetrated the tire
The data on the Tire and Loading Information
placard and tire pressure table shown here are
examples. Tire pressure specifications are vehi-
cle-specific and may deviate from the data
shown here. The tire pressure specifications
that are valid for your vehicle can be found on
the Tire and Loading Information placard and
tire pressure table on the vehicle.
General notes
The recommended tire pressures for the tires
mounted at the factory can be found on the
labels described here.
Operation with emergency spare wheel:
information on operation with the emergency
spare wheel can be found under "Emergency
spare wheel" (
Ypage 380).
Operation with a trailer: the applicable value
for the rear axle is the maximum tire pressure
value stated in the table inside the fuel filler flap.
Further information on tire pressures can be
obtained at a qualified specialist workshop.
Tire and Loading Information placard
:Recommended tire pressures
The Tire and Loading Information placard is on
the B-pillar on the driver's side (
Ypage 364).
The Tire and Loading Information placard con-
tains the recommended tire pressures for cold
tires. The recommended tire pressures are valid
for the maximum permissible load and up to the
maximum permissible vehicle speed.
Tire pressure table
The tire pressure table is on the inside of the fuel
filler flap. It shows the tire pressure for all tires
permitted at the factory for this vehicle; see
illustration (example).
The tire pressure table contains the recommen-
ded pressures for cold tires for various operat-
ing conditions, i.e. differing load and speed con-
ditions.
If a tire size precedes a tire pressure, the fol-
lowing tire pressure information is only valid for that tire size; see illustration (example).
The load conditions "partially laden" and "fully
laden" are defined in the table for different num-
bers of occupants and amounts of luggage. The
actual number of seats may differ.
358Tire pressure
Wheels and tires

Some tire pressure tables show only the rim
diameters instead of the full tire size, e.g.R18.
The rim diameter is part of the tire size and can
be found on the tire sidewall (
Ypage 369).
If the tire pressures have been set to the lower
values for lighter loads and/or lower road
speeds, the pressures should be reset to the
higher values:
Rif you want to drive with an increased load
and/or
Rif you want to drive at higher road speeds
The tire pressures for increased loads and/or
higher road speeds, shown in the tire pressure
table, may have a negative effect on driving
comfort.
If the tire pressure is not set correctly, this can
lead to an excessive build up of heat and a sud-
den loss of pressure.
For more information, contact a qualified spe-
cialist workshop.
Important notes on tire pressure
GWARNING
If the tire pressure drops repeatedly, the
wheel, valve or tire may be damaged. Tire
pressure that is too low may result in a tire
blow-out. There is a risk of an accident.
RCheck the tire for foreign objects.
RCheck whether the wheel is losing air or the valve is leaking.
If you are unable to rectify the damage, con-
tact a qualified specialist workshop.
GWARNING
If you fit unsuitable accessories onto tire
valves, the tire valves may be overloaded and
malfunction, which can cause tire pressure
loss. Due to their design, retrofitted tire pres- sure monitors keep the tire valve open. This
can also result in tire pressure loss. There is a
risk of an accident.
Only screw the standard valve cap or other
valve caps approved by Mercedes-Benz for
your vehicle onto the tire valve.
Use a suitable pressure gauge to check the tire
pressure. The outer appearance of a tire does not permit any reliable conclusion about the tire
pressure. On vehicles equipped with the elec-
tronic tire pressure monitor, the tire pressure
can be checked in the on-board computer.
The tire temperature and pressure increase
when the vehicle is in motion. This is dependent
on the driving speed and the load.
Therefore, you should only correct tire pres-
sures when the tires are cold.
The tires are cold:
Rif the vehicle has been parked with the tires
out of direct sunlight for at least three hours
and
Rif the vehicle has not been driven further than
1 mile (1.6 km)
The tire temperature changes depending on the
outside temperature, the vehicle speed and the
tire load. If the tire temperature changes by
18 ‡ (10 †), the tire pressure changes by
approximately 10 kPa (0.1 bar/1.5 psi)
. Take
this into account when checking the pressure of
warm tires. Only correct the tire pressure if it is
too low for the current operating conditions. If
you check the tire pressure when the tires are
warm, the resulting value will be higher than if
the tires were cold. This is normal. Do not
reduce the tire pressure to the value specified
for cold tires. The tire pressure would otherwise
be too low.
Observe the recommended tire pressures for
cold tires:
Ron the Tire and Loading Information placard
on the B-pillar on the driver's side
Rin the tire pressure table in the fuel filler flap
(Ypage 157)
Rprinted in yellow on the rim of the emer-
gency/collapsible spare wheel (depending on
vehicle equipment)
Underinflated or overinflated tires
Underinflated tires
GWARNING
Tires with pressure that is too low can over-
heat and burst as a consequence. In addition, they also suffer from excessive and/or irreg-
ular wear, which can severely impair the brak-
ing properties and the driving characteristics.
There is a risk of an accident.
Tire pressure359
Wheels and tires
Z

Information on tire pressures is displayed in the
multifunction display. After a few minutes of
driving, the current tire pressure of each tire is
shown in theServ.
menu of the multifunction
display, see illustration (example).
For information on the message display, refer to
the "Checking the tire pressure electronically"
section (
Ypage 363).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure rec-
ommended by the vehicle manufacturer on
the Tire and Loading Information placard on
the driver's door B-pillar or the tire pressure
label on the inside of the fuel filler flap. If your
vehicle has tires of a different size than the
size indicated on the Tire and Loading Infor-
mation placard or the tire pressure label, you
should determine the proper tire pressure for
those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale illuminates,
you should stop and check your tires as soon
as possible, and inflate them to the proper
pressure. Driving on a significantly underin-
flated tire causes the tire to overheat and can lead to tire failure. Underinflation also
reduces fuel efficiency and tire tread life, and
may affect the vehicle's handling and stop-
ping ability.
Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the driv-
er's responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of the TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate if the
system is not operating properly. The TPMS
malfunction indicator is combined with the
low tire pressure telltale. When the system
detects a malfunction, the warning lamp will
flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists.
When the malfunction indicator is illuminated,
the system may not be able to detect or signal
low tire pressure as intended. TPMS malfunc-
tions may occur for a variety of reasons,
including the mounting of incompatible
replacement or alternate tires or wheels on
the vehicle that prevent the TPMS from func-
tioning properly. Always check the TPMS mal-
function telltale after replacing one or more
tires or wheels on your vehicle to ensure that
the replacement or alternate tires and wheels
allow the TPMS to continue to function prop-
erly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
(
Ypage 357). Note that the correct tire pressure
for the current operating situation must first be
taught-in to the tire pressure monitor. If a sub-
stantial loss of pressure occurs, the warning
threshold for the warning message is aligned to
the taught-in reference values. Restart the tire
pressure monitor after adjusting the pressure of
the cold tires (
Ypage 364). The current pres-
sures are saved as new reference values. As a
result, a warning message will appear if the tire
pressure drops significantly.
The tire pressure monitor does not warn you of
an incorrectly set tire pressure. Observe the
notes on the recommended tire pressure
(
Ypage 357).
The tire pressure monitor is not able to warn you
of a sudd en loss of pressure, e.g. if the tire is
penetra

ted by a foreign object. In the event of a
362Tire pressure
Wheels and tires