MERCEDES-BENZ GLS 2023 Owners Manual

First letter(s) 1:
= Without: passenger vehicle tires according to
European manufacturing standards.
= "P": passenger vehicle tires according to US
manufacturing standards.
= "LT": light truck tires according to US manu-
facturing standards.
= "T": compact emergency spare wheels with
high tire pressure that are only designed for
temporary use in an emergency.
Aspect ratio 3:
Ratio between tire height and tire width in percent (tire height divided by tire width).
Tire code 4 (tire type):
= "R": radial tire
= "D": bias ply tire
= "B": bias radial tires
= "ZR": radial tire with a maximum speed above
149 mph (240 km/h) (optional)Rim diameter 5:
The diameter of the bead seat (not the diameter
of the rim Oange). The rim diameter is speciNed in
inches (in).
Load-bearing index 6:
Numerical code that speciNes the maximum load-
bearing capacity of a tire (e.g. "91" corresponds
to 1,356 lbs (615 kg)).
The load-bearing capacity of the tire must be atleast half the gross axle weight rating of your vehi-
cle. Do not overload the tires by exceeding the speciNed load limit.
See also: = Maximum permissible load on the tire and
loading information placard (  page 380)
= Maximum tire load (  page 387)
= Load index
Speed rating 7:
SpeciNes the approved maximum speed of the
tire.\bAn electronic speed limiter prevents your
vehicle from exceeding a speed of 130 mph
(210 km/h).
Make sure that your tires have the required speed
rating. You can obtain information on the required
speed rating from an authorized Mercedes-Benz
Service Center.
Summer tires
IndexSpeed ratingQup to 100 mph (160 km/h)Rup to 106 mph (170 km/h)Sup to 112 mph (180 km/h)Tup to 118 mph (190 km/h)Hup to 130 mph (210 km/h)Vup to 149 mph (240 km/h)Wup to 168 mph (270 km/h)Yup to 186 mph (300 km/h)Wheels and tires389

IndexSpeed ratingZR...Y1up to 186 mph (300 km/h)ZR...(..Y) 1over 186 mph (300 km/h)ZR1over 149 mph (240 km/h)
=
Specifying the speed rating as the "ZR" index
in tire code 4 is optional for tires up to
186 mph (300 km/h).
= If your tire code 4 includes "ZR" and there is
no speed rating 7, Nnd out what the maxi-
mum speed is from the tire manufacturer.
= If load-bearing index 6 and speed rating 7
are in brackets, the maximum speed rating of
your tire is above 186 mph (300 km/h). To
Nnd out the maximum speed, ask the tire man-
ufacturer.
All-weather tires and winter tiresIndexSpeed ratingQ M\fS 2up to 100 mph (160 km/h)T M\fS2up to 118 mph (190 km/h)H M\fS 2up to 130 mph (210 km/h)V M\fS2up to 149 mph (240 km/h)
Winter tires bear the
M snowOake symbol and
fulNll the requirements of the Rubber Manufactur-
ers Association (RMA) and the Rubber Association
of Canada (RAC) regarding the tire traction on
snow.
Load index 8:
= No speciNcation given: standard load (SL) tire
= "XL" or "Extra Load": extra load tire or rein-
forced tire
= "Light Load": light load tire
="C", "D", "E": a load range that depends on the
maximum load that the tire can carry at a cer-
tain pressure
DeNnition of terms for tires and loading
T ire structure and characteristics: describes the
number of layers or the number of rubber-coated
belts in the tire contact surface and the tire wall.
These are made of steel, nylon, polyester and other materials.
Bar: metric unit for tire pressure. 14.5038 pounds
per square inch (psi) and 100 kilopascal (kPa) is the equivalent of one bar.
DOT (Department of Transportation): DOT-marked
tires fulNll the requirements of the
U.S. Department of Transportation.
Average weight of the vehicle occupants: the
number of vehicle occupants for which the vehicle
is designed, multiplied by 150 lb (68 kg).
Uniform Tire Quality Grading Standards: a uniform
standard to grade the quality of tires with regard
1 "ZR" stated in the tire code.
2 Or "M\fS M" for winter tires.390Wheels and tires

to tread quality, tire traction and temperature
characteristics. The quality grading assessment is
made by the manufacturer following speciNcations
from the U.S. government. The quality grade of a
tire is printed on the side wall of the tire.
Recommended tire pressure: the recommended
tire pressure is the tire pressure speciNed for the
tires mounted on the vehicle at the factory.
The tire and information placard contains the rec-
ommended tire pressure for cold tires, the maxi- mum permissible load and the maximum permissi-
ble vehicle speed.
The tire pressure table contains the recommen-
ded tire pressure for cold tires under various oper-
ating conditions, i.e. loading and/or speed of the vehicle.
Increased vehicle weight due to optional equip- ment: the combined weight of all standard and
optional equipment available for the vehicle, regardless of whether it is actually installed on the
vehicle or not.
Rim: the part of the wheel on which the tire is
installed.GAWR (Gross Axle Weight Rating): the GAWR is
the maximum gross axle weight rating. The actual
load on an axle must never exceed the gross axle
weight rating. The gross axle weight rating can be
found on the vehicle identiNcation plate on the
B!

Maximum load on one tire: maximum load on one
tire. This is calculated by dividing the maximum axle load of one axle by two.
PSI (pounds per square inch): standard unit of
measurement for tire pressure.
Aspect ratio: ratio between tire height and tire
width in percent.
Tire pressure: the pressure inside the tire which
applies an outward force to every square inch of
the tire. The tire pressure is speciNed in pounds
per square inch (psi), in kilopascals (kPa) or in bar. The tire pressure should only be corrected whenthe tires are cold.
Cold tire pressure: the tires are cold when the
vehicle has been parked for at least 3 hours with- out direct sunlight on the tires or the vehicle has
been driven for less than 1 mile (1.6 km).
Tire contact surface: the part of the tire that
comes into contact with the road.
Tire bead: the purpose of the tire bead is to
ensure that the tire sits securely on the wheel rim. There are several wire cores in the tire bead toprevent the tire from changing length on thewheel rim.Side wall: the part of the tire between the tread
and the tire bead.
Weight of optional equipment: the combined
weight of the optional equipment weighing more
than the replaced standard parts and more than 5 lbs (2.3 kg). This optional equipment, such ashigh-performance brakes, level control system, a
roof luggage rack or high-performance batteries,
is not included in the curb weight and the weight of the accessories.
TIN (Tire *dentiNcation Number): a unique identiN-
cation number which can be used by a tire manu-
facturer to identify tires, for example, in a product recall, and thus identify the purchasers. The TIN is
made up of the manufacturer\bs identity code, tire
size, tire type code and the manufacturing date.
Load-bearing index: the load-bearing index is a
code that contains the maximum load-bearing capacity of a tire.
Traction: traction is the grip resulting from friction
between the tires and the road surface.
Wear indicator: narrow bars (tread wear bars) that
are distributed over the tire contact surface. If thetire tread is level with the bars, the wear limit of 1/16 in (1.6 mm) has been reached.
Distribution of vehicle occupants: distribution of
vehicle occupants over designated seat positions
in a vehicle.
Maximum permissible payload weight: nominal
load and luggage load plus 150 lb (68 kg) multi- plied by the number of seats in the vehicle.
Changing a wheel
Notes on selecting, installing and replacing tires
*NOTE Mercedes-AMG vehiclesObserve the notes in the Supplement.
You could otherwise fail to recognize
dangers.&WARNING Risk of accident due to incor-
rect wheel and tire dimensions
If wheels and tires of the wrong size are instal-
led, the service brakes or components in the
392Wheels and tires

brake system and in the wheel suspension
may be damaged.Always replace wheels and tires with
ones that fulNll the speciNcations of the
original part.
For wheels, pay attention to the following:
= Designation
= Type
For tires, pay attention to the following: = Designation
= Manufacturer
= Type
&WARNING Risk of injury through exceed-
ing the speciNed tire load-bearing capa-
city or the permissible speed rating
Exceeding the speciNed tire load rating or the
permissible speed rating may lead to tire dam-
age and to the tires bursting.
Therefore, only use tire types and sizes
approved for your vehicle model.Observe the tire load rating and speed
rating required for your vehicle.*NOTE Vehicle and tire damage caused by
non-approved tire types and sizes
For safety reasons, only use tires, wheels and
accessories which have been specially
approved by Mercedes-Benz for your vehicle.
These tires are specially adapted to the active safety systems, such as ABS, ESP n
and
4MATIC, and marked as follows:
= MO = Mercedes-Benz Original
= MOE = Mercedes-Benz Original Extended
(run-Oat tires only for certain wheels)
= MO1 = Mercedes-Benz Original (only cer-
tain AMG tires)
Otherwise, certain properties, such as han-
dling characteristics, vehicle noise emissions,
consumption, etc. could be adversely aMec-
ted. Furthermore, other tire sizes could result
in the tires rubbing against the body and axle
components when loaded. This could result in
damage to the tire or the vehicle.
Only use tires, wheels and accessories that have been checked and recommended by
Mercedes-Benz.*NOTE Risk to driving safety from retrea-
ded tires
Retreaded tires are neither tested nor recom- mended by Mercedes-Benz, since previous
damage cannot always be detected on retrea-
ded tires.
For this reason driving safety cannot be guar-
anteed.
Do not use used tires if you have no information about their previous usage.*NOTE Possible wheel and tire damage
when driving over obstacles
Large wheels have a smaller section width. As
the section width decreases, the risk of
Wheels and tires393

wheels and tires being damaged when driving
over obstacles increases.Avoid obstacles or drive especially care-
fully.Reduce your speed when driving over
curbs, speed bumps, manhole covers and potholes.Avoid particularly high curbs.*NOTE Possible wheel and tire damage
when parking on curbs or in potholes
Parking on curbs or in potholes can damage
the wheels and tires.
Only park on as level a surface as possi-
ble.Avoid curbs and potholes when parking.*NOTE Damage to electronic component
parts due to the use of tire-installing tools
Vehicles with tire pressure monitoring sys-
tem: There are electronic component parts in
the wheel.
If tire-installing tools are positioned in the area
of the valve, the electronic components could be damaged.Tire-installing tools should not be applied
in the area of the valve.Always have tires change at a qualiNed
specialist workshop.*NOTE Damage to summer tires at low
ambient temperatures
At low ambient temperatures, tears could form
when driving with summer tires, causing per-
manent damage to the tires.
At temperatures below 45 °F (7 °C) use M M\fS tires.
Accessory parts which are not approved for your
vehicle by Mercedes-Benz, or which are not used
correctly, can impair the operating safety.
Before purchasing and using non-approved acces-
sories, visit a qualiNed specialist workshop and
inquire about:
= Suitability
=Legal stipulations
= Factory recommendations&WARNING Risk of accident with high per-
formance tires
The special tire tread in combination with the
optimized tire compound means that the risk of skidding and hydroplaning on wet roads is
increased.
In addition, the tire grip is greatly reduced at a
low outside temperature and tire running tem-
perature.
Switch on the ESP n
and adapt your driv-
ing style accordingly.Use M M\fS tires at outside tempera-
tures of less than 50 °F (10 °C).Only use the tires for their intended pur-
pose.394Wheels and tires

Observe the following when selecting, installing
and replacing tires:
= Furthermore, the use of certain tire types in
certain regions and areas of operation can be
highly beneNcial.
= Only use tires and wheels of the same type
(summer tires, winter tires, MOExtended tires)
and the same make.
= Only install wheels of the same size (les and
right) on each axle.
It is only permissible to install a diMerent
wheel size in the event of a Oat tire in order to
drive to the specialist workshop.
= Vehicles with a tire pressure monitoring sys-
tem: all installed wheels must be equipped
with functioning sensors for the tire pressure
monitoring system.
= At temperatures below 45°F (7°C) use winter
tires or all-season tires marked M M\fS for
all wheels.
Winter tires provide the best possible grip in
wintry road conditions.= For M\fS tires, only use tires with the same
tread.
= Observe the maximum permissible speed for
the M\fS tire which is installed.
If the tire\bs maximum speed is below that of
the vehicle, this must be indicated by an
appropriate label in the driver\bs Neld of vision.
= Break in new tires at moderate speeds for the
Nrst 60 miles (100 km).
= Replace the tires aser six years at the latest,
regardless of wear.
= When replacing with tires that do not feature
run-Oat characteristics: vehicles with
MOExtended tires are not equipped with a
TIREFIT kit at the factory. Equip the vehicle with a TIREFIT kit aser replacing with tires that
do not feature run-Oat characteristics, e.g.
winter tires.
For more information on wheels and tires, contact
a qualiNed specialist workshop.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 375)=
Tire and loading information placard
(  page 380)
= Tire size designation, load-bearing capacity,
speed rating and load index (  page 388)
= Tire pressure table (  page 377)
= Notes on the emergency spare wheel
(  page 403)
Notes on rotating wheels
&WARNING Risk of injury through diMerent
wheel sizes
Rotating the front and rear wheels can
severely impair the driving characteristics.
The wheel brakes or suspension components
may also be damaged.
Rotate front and rear wheels only if the
wheels and tires are of the same dimen-
sions.
Observe the instructions and safety notes on
"Changing a wheel" (  page 392)
Wheels and tires395

The wear patterns on the front and rear wheels
diMer:
= Front wheels wear more on the tire shoulder
= Rear wheels wear more in the center of the
tire
Do not drive with tires that have too little tread
depth. This signiNcantly reduces traction on wet
roads (hydroplaning).
On vehicles that have the same size front and rear
wheels, rotate the wheels according to the inter- vals in the tire manufacturer\bs warranty book in
your vehicle documents. If this is not available, rotate the tires every 3,000 to 6,000 miles(5,000 to 10,000 km), depending on the wear.Ensure that the direction of rotation is main-
tained.
Notes on storing wheels
When storing wheels, observe the following notes:
= Aser removing wheels, store them in a cool,
dry and preferably dark place.
= Protect the tires from contact with oil, grease
or fuel.
Overview of the tire-change tool kit
Apart from some country-speciNc variants, vehi-
cles are not equipped with a tire-change tool kit. For more information on which tools are required
and approved to perform a wheel change on your
vehicle, consult a qualiNed specialist workshop.
Required tire-changing tools may include,
forexample:
= Jack
= Chock
= Lug wrench
Tire-change tool kit 1 is located under the cargo
Ooor.
\bDepending on the model, the tire change tool
kit may be located in other positions under
the cargo Ooor.
The tire-change tool kit includes the following:
= Jack
= Lug wrench
= Wheel studs
= Extension attachment for wheel studs, if nec-
essary (depending on vehicle version)
= Folding chock
= Ratchet wrench
Preparing the vehicle for a wheel change
Requirements:
= The vehicle is not on a slope.
396Wheels and tires

=The vehicle is on solid, non-slippery and level
ground.
= The required tire-change tool kit is available.\bIf your vehicle is not equipped with the tire-
change tool kit, consult a qualiNed specialist
workshop to Nnd out about suitable tools.Apply the electric parking brake manually.Move the front wheels to the straight-ahead
position.Shis the transmission to position ].Vehicles with level control system: Set the
normal vehicle level (  page 250).Switch oM the vehicle.Make sure that the vehicle cannot be started.Place chocks or other suitable items under the
front and rear of the wheel that is diagonally
opposite the wheel you wish to change.Raise the vehicle (  page 398).
Additionally, for Mercedes-Maybach vehicles:
Retract the running boards (  page 79)To remove stone chipping protective covers
2 :Loosen expansion rivet 1 and pull it out.Fold down and remove stone chipping protec-
tive covers 2.Removing and installing the wheel trim/hub caps
Requirements:
= The vehicle is prepared for a wheel change
(  page 396).
Plastic hub cap
To remove: turn the center cover of the hub
cap counter-clockwise and remove the hub cap.To install: make sure that the center cover of
the hub cap is turned counter-clockwise.Position the hub cap and turn the center cover clockwise until the hub cap engages physically and audibly.Wheels and tires397

Aluminum hub capTo remove: position socket 2 from the tire-
change tool kit on hub cap 1.Position wheel wrench 3 on socket 2.Using wheel wrench 3, turn hub cap 1
counter-clockwise and remove it.To install: follow the instructions above in
reverse order.\bSpeciNed tightening torque: 18 lb-s (25 Nm).Raising the vehicle when changing a wheel
Requirements:
= There are no persons in the vehicle.
= The vehicle has been prepared for a wheel
change (  page 396).
Important notes on using the jack:
= Use only a vehicle-speciNc jack that has been
approved by Mercedes-Benz to raise the vehi-
cle.
= The jack is only designed for raising and hold-
ing the vehicle for a short time while a wheel is being changed and not for maintenance
work under the vehicle.
= The jack must be placed on a Nrm, Oat and
non-slip surface. If necessary, use a large, Oat,
load-bearing, non-slip underlay.
= The foot of the jack must be positioned verti-
cally under the jack support point.
Rules of conduct when the vehicle is raised:
= Never place your hands or feet under the vehi-
cle.
= Never lie under the vehicle.
= Do not start the vehicle and do not release the
electric parking brake.
= Do not open or close any doors or the tailgate.
398Wheels and tires