
#Stores cur rent speed 2(once af terst arting
th eve hicle).
or
#Calls up stored speed 2.#Deactivates cruise contro l1.
#Press the le ver brief ly:st ored speed is
increased 3orreduced
4 by1mp h (1 km/h).
or
#Press the le ver be yond the pressure point:
st ored speed is increased 3orreduced
4 by10 mph (10 km/h).
If cruise contro l has been deactivated, the cur‐
re nt driven speed is adop ted with 3or4. %
Ifyo u brake, deactivate ESP
®or if ESP®
inter venes, cruise control is deacti vated.
When youswit choff theve hicle, the last
speed stored is cleared.
Setting the speed limit for winter tires
Multimedia sy stem:
, 9 H K L F O H.î 9 H K L F O H 6 H W W L Q J V. : L Q
W H U 7 L U H V / L P L W
#Select the speed or deactivate the function.
Distance Pilot DISTRONIC
Fu nction of Distance Pilot DISTRONIC
Dis tance Pilot DISTRONIC:
RMaintains the set speed and accelerates or
decelerates theve hicle if the dis tance from
th eve hicle in front permits.
RAssists youin main taining the dis tance from
th eve hicle in front and can bring your vehi‐
cle toast andstill if necessar y.
RBrakesyour vehicle with up to50 % of the
maximum possible braking po wer.If greater
decelera tion performance is requ ired, a vis‐
Driving and parking 16
1

Noise or unusual handling characteristics
While driving, pay attention tovibrations, noises
and unusual handling characteristics, e.g. pulling
to one side. This may indicate that the wheels or
tires are damaged. If you suspect that a tire is
defective, reduce your speed immediatel y.Stop
th eve hicle as soon as possible tocheck the
wheels and tires for dama ge. Hidden tire dam‐
age could also be causing the unusual handling
ch aracteristics. If youfind no signs of damage,
ha ve the tires and wheels checked at a qualified
specialist workshop.
Re gular checking of wheels and tires
&
WARNING Risk of accident from dam‐
aged tires
Dama ged tires can cause tire pressure loss.
As a result, you could lose cont rol of your
ve hicle.
#Check the tires regularly for signs of
dama geand replace any damaged tires
immediatel y.
&
WARNING Risk of aquaplaning due to
insuf ficient tire tread
Insuff icient tire tread will result in reduced
tire grip. The tire tread is no longer able to
dissipate water.
This means that in heavy rain or slush the
ri sk of hydroplaning is increased, in particu‐
lar if vehicle speed is not adap tedto suit the
conditions.
If th e tire pressure is too high or too lo w,
tires may exhibit dif fere nt le vels of wear at
dif fere nt locations on the tire conta ct sur‐
fa ce.
#Thus, you should regularly check the
tread de pth and the condition of the tire
conta ct surf ace across the entire width
of all tires.
Minimum tread dep thfor:
RSummer tires: âin (3 mm)
RM+S tires: ãin (4 mm)
#For saf etyre asons, replace the tires
before the legally prescribed limit for
th e minimum tread dep thisreached.
Car ryout thefo llowing checks on all wheels reg‐
ularly, at least once a month or as requ ired, e.g.
prior toa long journey or driving off- road:
RCheck the tire pressure (→page 339).
RVisual check of wheels and tires for dama ge.
RCheck theva lve caps.
The valves must be pr otected against mois‐
ture and dirt bytheva lve caps appr oved
especially foryo ur vehicle byMercedes-Benz.
RVisual check of the tread dep thand the tire
conta ct surf ace across the entire width.
The minimum tread dep thfor summer tires is
â in (3 mm) and for winter tires ãin
(4 mm).
338 Wheels and tires

The system checks the tire pressure of the tires
ins talled on theve hicle bymeans of a tire pres‐
sure sensor.
New tire pressure sensor, e.g. in winter tires, are
automatically taught-in thefirs t time they are
driven.
The tire pressure appears in the multifunction
display (
→page 202).
If th ere is a subs tantial pressure loss or if the
tire temp erature is excessive, a warning will be
given:
RVi a display messages (→page 409).
RViath eh warning lamp in the instrument
clus ter (→page 440).
It is the driver's responsibility toset the tire
pressure tothere commended cold tire pressure
suitable forth e operating situation. Set the tire
pressure for cold tires using a tire pressure
ga uge. Notethat the cor rect tire pressure forth e
cur rent operating situation must firs t be taught-
in to the tire pressure monitor.
In most cases, the tire pressure monitoring sys‐
te m will auto matically update the new refere nce va
lues af teryo u ha vechanged the tire pressure.
Yo u can, ho wever,also update there fere nce val‐
ues byrestarting the tire pressure monitoring
sy stem manually (
→page 345).
Sy stem limitations
The t
ire pressure monitoring sy stem does not
issue a warning:
RIfth e tire pressure is set incor rectly.
RIfth ere is a sudden pressure loss caused, for
ex ample, byafo re ign object penetrating the
tire.
RIf th ere is a malfunction caused byano ther
ra dio signal source.
Be sure toalso observ eth efo llowing fur ther
re lated subjects:
RNo tes on tire pressure (→page 339)
Checking the tire pressure with the tire pres‐
sure moni toring sy stem
Requ irements
RThe ignition is switched on. On-board computer:
, 6 H U Y L F H. 7 L U H 3 U H V V X U H
One of thefo llowing displa ysappears:
RCur rent tire pressure of ea chwheel:
R 7 L U H S U H V V X U H Z L O O E H G L V S O D \ H G D I W H U G U L Y L Q J D
I H Z P L Q X W H V
R 7 L U H 3 U H V V X U H 0 R Q L W R U $ F W L Y H: thete ach-in
process of the sy stem is not yet comple te.
The tire pressures are already being moni‐
to re d.
#Compare the tire pressure with there com‐
mended tire pressure forth e cur rent operat‐
34 4
Wheels and tires

IndexS peedrating
ZR...Y
1up to186mp h(3 00 km/h)
ZR...(..Y)
1ove r18 6mp h(3 00 km/h)
ZR
1ove r14 9mp h (240 km/h)
RSpecifying the speed rating as the "ZR" index
in tire code 4is optional for tires up to
18 6mp h(3 00 km/h).
RIfyo ur tire co de4 includes "ZR"andthere
is no speed rating 7,find out what the max‐
imum speed is from the tire manufacturer.
RIf load-bearing index 6and speed rating 7
are in brac kets, the maximum speed rating of
yo ur tire isabo ve186mp h (300 km/h). To
fi nd out the maximum speed, ask the tire
manufacturer. All-weather tires and winter tires
Inde
xS peedrating
Q M+S
2up to100mp h (160 km/h)
T M+S
2up to118mp h(190 km/h)
H M+S
2up to130mp h (2 10km/h)
V M+S
2up to149mp h (240 km/h)
Winter tires bear thei snowflake symbol
and fulfill therequ irements of theRu bber Manu‐
fa cturers Association (RMA) and theRu bber
Association of Canada (RAC) rega rding the tire
traction on sno w.
Load index 8
:RNo specification given: standard load (SL)
tire
R"XL" or "Extra Load": extra load tire or rein‐
fo rc ed tire
R"Light Load": light load tire
R"C", "D", "E": a load range that depends on
th e maximum load that the tire can car ryat a
cer tain pressure
Definitions for tires and loading
Ti re stru ctureand characteristics: describes
th e number of la yers or the number of rubber-
coated belts in the tire conta ct surface and the
tire wall. These are made of steel, nylon, poly‐
es ter and other materials.
Bar: metric unit for tire pressure .
14 .5038 pounds per square inch (psi) and
10 0 kilopascal (kPa) is the equivalent of one bar.
DOT (Department of Transport ation):DOT
mar ked tires fulfill therequ irements of the
US Department of Transpor tatio n.
Av erage weight of theve hicle occupants: the
number of vehicle occupants for which th eve hi‐
cle is designed, multiplied by150 lb (68 kg).
1"ZR" stated in the tire code.2Or "M+S i"for winter tires
Wheels and tires 355

Observethefo llowing when selecting, mounting
and replacing tires:
ROnly use tires and wheels of the same type
(summer tires, winter tires, MOEx tended
tires) and the same make.
ROnly mount wheels of the same size on one
axle (left and right).
It is only permissible todeviate from this rule
in theeve nt of a flat tire in order todrive to
th e specialist workshop.
ROnly mount tires of the cor rect size onto the
wheels.
RVe hicles with a tire pressure monitoring
sy stem: All mounte d wheels must be equip‐
ped with functioning sensors forth e tire
pressure monitoring sy stem.
RAt temp eratures below 45 °F (7 °C), use win‐
te r tires or all-season tires mar ked M+S for
all wheels.
Wi nter tires bearing thei snowflake sym‐
bol in addition tothe M+S marking pr ovide
th e best possible grip in wintry road condi‐
tions.
RFo r M+S tire , onlyuse tires with the same
tread.
RObser vethe maximum permissible speed for
th e M+S tire mounted.
If th is is below theve hicle's maximum speed,
th is must be indicated in an appropriate label
in the driver's field of vision.
RBreak in new tires at moderate speeds for
th efirs t 60 miles (100 km).
RRe place the tires af ter six years at the latest,
re ga rdless of wear.
RWhen replacing with tires that do not fea‐
ture run-flat characteristics: Vehicles with
MOExtended tires are not equipped with a
TIREFIT kit at thefa ctor y.Equip theve hicle
with a TIREFIT kit af terre placing with tires
th at do not feature run-flat characteristics,
fo rex ample winter tires.
Fo r more information on wheels and tires, con‐
ta ct a qualified specialist workshop.
Be sure toalso observ eth efo llowing fur ther
re lated subjects:
RNo tes on tire pressure (→page 339)
RTire and Loading Info rmation placard
(→page 345)
RTi re size designation, load-beari ng capacity,
speed rating and load ind ex(→page 353)
RTire pressure table (→page 341)
Note s on inter changing wheels
&
WARNING Risk of injury thro ugh dif fer‐
ent wheel sizes
Inter changing the front and rear wheels if the
wheels or tires ha vediffere nt dimensions
may se verely impair the driving characteris‐
tics.
The wheel brakes or wheel suspension com‐
ponents may also be damaged.
#Ro tate front and rear wheels only ifth e
wheels and tires are of the same dimen‐
sions.
360 Wheels and tires

Side impact protection .......................... .177
Side windo ws
Child safetyloc kin there ar
passenger compartment ...................... .54
Closin g .................................................. 70
Closin gwit hth e SmartK ey.................... 72
Con venience closing .............................. 71
Con venience opening ............................ 71
Opening .................................................7 0
Opening with the SmartK ey................... 71
Problem .................................................7 2
Ro ller sunblind ...................................... 69
Side windo ws
see Window li fter
see Windo ws
Size designation (tires) ........................... 353
Skid chains .............................................. 339
Sliding sunroof ...........................................7 4
Au tomatic functions .............................. 76
Closin g .................................................. .74
Closin gwit hth e SmartK ey.................... 72
Opening .................................................7 4
Opening with the SmartK ey................... 71
Problem .................................................7 7Ra
in closing function ............................ .76
SmartK ey................................................... 55
Emergency key ...................................... 57
Ke yring attachment .............................. 57
Overview ...
............................................ 55
Pa nic alarm ........................................... 56
Problem ................................................. 58
Un locking setting .................................. 56
Sma rtKe y
see Ignition key
see Locking
see Vehicle key
Smartphone Starting vehicle ................................... 130
Smartphone see Android Auto
see Apple CarPlay™
see Telephone
Snow chains ............................................ 339
Snow chains
see Skid chains
Soc ket (12 V) ............................................ 107
Fr ont center console ............................1 07Re
ar passenger compartment ............ .107
Tr unk .................................................. .108
Soc ket (1 15V)
Re ar passenger compartment ............ .107
Software update Information .......................................... 238
Performing .......................................... 238
Sound PRE-SAFE
®Sound ................................. 44
Sound see Burmes ter
®sur round sound sy stem
see Sound settings
Sound settings ....................................... .300
Ad justing treble, mid and bass ............ 300
Information .......................................... 300
Speech dialog sy stem
see Voice Cont rol Sy stem
Speed limit for winter tires
Setting ................................................. 161
Speed Limit Pilot .............................. 161, 192
Di
spl ay ................................................. 161
Setting ................................................. 192
Speed rating (ti res) ................................. 353
468
Index