2018 MERCEDES-BENZ SL CLASS tire pressure

MOExtended tires (tires with run-flat
characteristics) With MOExtended tires (tires with run flat char-
acteristics), you can continue to drive you rv ehi-
cle even if there is at otal loss of pressure in one
or more tires.
MOExtended tires may only be use dinc onjunc-
tion with an active tire pressure loss warning
system or with an active tire pressure monitor
and on wheels specifically tested by Mercedes-
Benz.
Notes on driving with MOExtended tires with a
flat tire ( Y
pag e2 47).
Vehicles equipped with MOExtended tires are
not equipped with aT IREFIT kit at the factory. It
is therefore recommende dt hat you additionally
equip you rv ehicl ew ith aT IREFIT kit if you mount
tires that do not feature run-fla tc haracteristics,
e.g. winter tires. AT IREFIT kit can be obtained
from aq ualified specialist workshop.
Winter operation
General notes Have you rv ehicl ew inter-proofed at aq ualified
specialist worksho patt he onset of winter.
Observe the notes in the "Changing aw heel"
section ( Y
pag e2 80).
Driving with summer tires At temperatures below 45 ‡( +7 †), summer
tires lose elasticity and therefore traction and
braking power. Change the tires on you rv ehicle
to M+S tires .U sing summe rt ires at very cold
temperatures coul dc aus ec racks to form,
thereby damaging the tires permanently.
Mercedes-Benz cannot accept responsibility for
this type of damage.
G WARNING
Damaged tires can caus et ire inflation pres-
sure loss. As ar esult, you coul dl ose control of
you rv ehicle. There is ar isk of accident.
Check the tires regularl yf or signs of damage
and replace any damaged tires immediately. M+S tires
G WARNING
M+S tires with at ire tread depth of less than

To avoid hazardous situations: R
never install snow chains to the front
wheels R
alway si nstall snow chains in pairs to the
rear wheels.
For safety reasons, Mercedes-Benz recom-
mends that you only use snow chains that have
been specially approved for your vehicle by
Mercedes-Benz ,ora re of ac orresponding
standard of quality. For more information,
please contact aq ualified specialist workshop.
If you inten dtom ount snow chains, please bear
the following points in mind: R
Snow chains may not be mounted on all
wheel/tire combinations. Permissible wheel-
tire combinations ( Y
page 284).R
Only use snow chains when driving on roads
completely covered by snow. Remove the
snow chains as soon as possible when you
come to ar oad that is not snow-covered.R
Local regulations may restrict the use of snow
chains. Observe the appropriate regulations if
you wish to mount snow chains. R
Do not exceed the maximum permissible
speed of 30 mph (50 km/h).
You may wish to deactivate ESP ®
when pulling
away with snow chains installed ( Y
page 60).
You can thereby allow the wheels to spin in a
controlled manner ,a chieving an increased driv-
ing force (cutting action).
Information about driving with an emergency
spare wheel ( Y
page 285). Tire pressure
Tire pressur es pecifications
Important safety notes
G WARNING
Underinflated or overinflated tires pose the
following risks: R
the tires may burst, especially as the load
and vehicle speed increase. R
the tires may wear excessively and/or
unevenly, which may greatly impair tire
traction. R
the driving characteristics, as well as steer-
ing and braking, may be greatly impaired.
There is ar isk of an accident.
Follow recommended tire inflation pressures
and check the pressure of all the tires includ-
ing the spare wheel: R
monthly, at least R
if the load changes R
before beginning al ong journeyR
under different operating conditions, e.g.
off-road driving
If necessary, correc tt he tire pressure.
The data on the Tire and Loading Information
placard and tire pressure table shown here are
examples. Tire pressure specification sa re 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 factor yc an be found on the
labels described here.
Operation with an emergency spar ew heel:
information on operation with an emergency
spare wheel can be found in the general notes in
the "Emergency spare wheel" section
( Y
page 286).
Further information on tire pressures can be
obtained at aq ualified specialist workshop.Tir ep re ssure 263
Wheels and tires Z

Tire and Loadin gI nfor matio np lacard
C
Recommended tire pressures
The Tire and Loading Informatio np la card is on
the B-pillar on the driver's side ( Y
page 271).
The Tire and Loading Informatio np la card con-
tains the recommende dt ire pressures for cold
tires. The recommende dt ire pressures ar ev alid
for the maximum permissibl el oa da nd up to the
maximum permissibl ev ehicl es peed.
Tire pressure table The tire pressure table is on the insid eoft he fuel
fille rf lap. It shows the tire pressure for al lt ires
permitted at the factory for thi sv ehicle; see
illustratio n( ex ample).
The tire pressure table contains the recommen-
de dp ressures for col dt ire sf or various operat-
ing conditions, i.e .d if ferin gl oa da nd spee dc on-
ditions.
If at ire size precedes at ire pressure, the fol-
lowing tire pressure informatio ni so nl yv alid for
tha tt ire size; see illustratio n( ex ample). The load conditions "partiall yl aden "a nd "fully
laden" ar ed ef ine dint he table for different num-
bers of occupants and amounts of luggage .T he
actual numbe rofs eats ma yd if fer.
Some tire pressure table ss ho wo nl yt he rim
diameters instea doft he full tire size, e.g. R18 .
Ri md iame te risp ar toft he tire size and can be
found on the tire sidewall ( Y
page 275).
If the tire pressures have been set to the lower
values for lighte rl oads and/or lowe rr oad
speeds ,t he pressures shoul dber eset to the
highe rv alues : R
if yo uw an ttod rive with an increased load
and/or R
if yo uw an ttod rive at highe rr oa ds peeds
The tire pressures for increased load sa nd/or
highe rr oa ds peeds, shown in the tire pressure
table ,m ay have an egative effect on driving
comfort.
If the tire pressure is not set correctly, thi sc an
lead to an excessive build-u pofh ea ta nd as ud -
de nl os sofp ressure.
For mor ei nformation, contact aq uali fied spe-
cialist workshop.264
Tire pressure
Wheel sa nd tires

Important notes on tire pressure
G WARNIN G
If th et ir ep ressur ed rops repeatedly, th e
wheel, valv eort ir em ay be damaged. Tir e
pressur et ha tist oo low may result in at ir e
blow-out .T her eisar is kofana ccident.R
Chec kt he tire for foreign objects .R
Chec kw hether th ew hee lisl osing air or th e
valv eisl eaking .
If you are unable to rectify th ed amage, con-
tac taq ualified specialist workshop.
G WARNIN G
If you fit unsuitable accessories onto tire
valves, th et ir ev alves may be overloaded and
malfunction ,w hic hc an caus et ir ep ressur e
loss .D ue to their design ,r etrofitte dt ir ep res-
sur em onitors keep th et ir ev alv eo pen .T his
can also result in tire pressur el oss .T her eisa
ris kofana ccident.
Only screw th es ta ndard valv ec ap or other
valv ec ap sa pprove dbyM ercedes-Ben zf or
your vehicl eo nt ot he tire valve.
Use as uitable pressur eg auge to chec kt he tire
pressure. The outer appearanc eofat ir ed oes
no tp ermit any reliable conclusio na bout th et ir e
pressure. On vehicles equipped wit ht he elec -
tronic tire pressur em onitor, th et ir ep ressur e
can be checke dint he on-board computer.
The tire temperature and pressur ei ncreas e
when th ev ehicl eisinm otion .T his is dependen t
on th ed riving spee da nd th el oad.
Therefore, you should only correc tt ir ep res-
sures when th et ir es are cold.
The tires are cold: R
if th ev ehicl eh as been parked wit ht he tires
out of direct sunligh tf or at least three hour s
and R
if th ev ehicl eh as no tb een driven further than
1m ile (1. 6k m)
The tire temperature changes depending on th e
outside temperature, th ev ehicl es pee da nd th e
tire load. If th et ir et em p erature changes by
18 ‡( 10
†), th et ir ep ressur ec ha nges by
approximately 10 kP a( 0. 1b ar/1.5 psi) .T ak e
this int oa ccoun tw hen checkin gt he pressur eo f
warm tires .O nl yc orrect th et ir ep ressur eifiti s to ol ow for th ec urren to perating conditions. If
you chec kt he tire pressur ew hen th et ir es are
warm ,t he resulting value will be higher than if
th et ir es were cold. This is normal. Do no t
reduce th et ir ep ressur etot he value specifie d
for cold tires .T he tire pressur ew ould otherwise
be to ol ow.
Observ et he recommended tire pressures for
cold tires : R
on th eT ir ea nd Loading Information placard
on th eB -p illar on th ed river' ss ideR
in th et ir ep ressur et able on th ei nside of th e
fuel filler flap R
printe diny ellow on th er im of th ee mer-
gency/collapsible spar ew hee l( dependin go n
vehicl ee quipment)
Underinflated or overinflated tires
Underinflated tires
G WARNIN G
Tires wit hp ressur et ha tist oo low can over-
heat and burs tasa consequence .Ina ddition ,
they also suffer from excessiv ea nd/o ri rreg-
ular wear, whic hc an severely impair th eb rak -
ing properties and th ed riving characteristics .
Ther eisar is kofana ccident.
Avoid tire pressures that are to ol ow in all th e
tires ,i ncludin gt he spar ew heel.
Underinflated tires may: R
overheat, leadin gtot ir ed efectsR
adversely affec th andlin gR
wear excessively and/o ru nevenlyR
hav eana dverse effec tonf uel consumption
Overinflated tires
G WARNIN G
Tires wit he xces sively high pressur ec an burs t
because they are damaged mor ee asil yb y
road debris, pothole se tc .Ina ddition ,t he y
also suffer from irregular wear ,w hic hc an
severely impair th eb raking properties and th e
driving characteristics .T her eisar is kofa n
accident. Tire pressure 265
Wheels and tires Z

Avoi dt ire pressures tha ta re too high in al lt he
tires, including the spare wheel.
Overinflated tire sm ay :R
increase the braking distance R
adversel ya ffect handlingR
wear excessivel ya nd/or unevenlyR
have an adverse effect on rid ec omfortR
be more susceptibl etod amag e
Maximum tire pressures
C
Example: maximu mp er missibl et ire pres-
sure
Never exceed the maximu mp er missibl et ire
inflation pressure. Alway so bs erve the recom-
mended tire pressure for your vehicl ew he n
adjusting the tire pressure ( Y
page 263).
i The actual values for tire sa re vehicle-spe-
cifi ca nd ma yd ev iate from the values in the
illustration.
Checkin gt he tire pressures
Important safety notes The tire pressure monitor does not warn yo uo f:R
incorrectly set tire pressure R
sudden loss of tire pressure, e.g .f rom af or-
eign object tha th as penetrated the tire
Observ et he notes on tire pressure
( Y
page 263). Informatio nona ir pressure for the tire sony ou r
vehicl ec an be found: R
on the vehicle's Tire and Loading Information
placard on the B-pillar R
on the tire pressure table in the fuel fille rf lapR
in the "Tire pressure" section
Checkin gt ire pressure sm anuallyTo determine and set the correct tire pressure,
procee dasf ollows: X
Remove the valve cap of the tire tha ti stob e
checked. X
Press the tire pressure gaug es ecurel yo nto
the valve. X
Read the tire pressure and compar eittot he
recommende dv alue on the Tire and Loading
Informatio np la card or the tire pressure table
( Y
page 263). X
If the tire pressure is too low, increase the tire
pressure to the recommende dv alue.X
If the tire pressure is too high, release air. To
do so, press down the meta lp in in the valve,
using the tip of ap en for example. The nc heck
the tire pressure agai nu si ng the tire pressure
checker. X
Screw the valve cap onto the valve. X
Repeat thes es tep sf or the othe rt ires.
Tire pressure loss warning system
(Canada only)
General notes While the vehicl eisinm otion, the tire pressure
loss warning system monitors the set tire pres-
sure using the rotational speed of the wheels.
Thi se nables the system to detect significant
pressure loss in at ire .Ift he speed of rotatio no f
aw heel change sasa resul tofa loss of pressure,
ac orresponding warning message will appear in
the multifunctio nd is play.
Yo uc an recognize the tire pressure loss warning
by the Run Fla tI ndicator Active Press
'OK 'toR estart message which appear si n
the Serv. menu of the multifunctio nd is play.
Informatio nont he message display can be
found in the "Restarting the tire pressure loss
warning system "s ectio n( Y
page 267).266
Tire pressure
Wheel sa nd tires

Important safety notes The tire pressur ew arning system does no tw arn
you of an incorrectl ys et tire pressure. Observ e
th en otes on th er ecommended tire pressur e
( Y
page 263).
The tire pressur el oss warning does no tr eplace
th en ee dtor egularly chec kt he tire pressure. An
eve nl oss of pressur eons everal tires at th e
sam et im ec anno tbed etecte dbyt he tire pres-
sur el oss warning system.
The tire pressur em onitor is no ta ble to warn you
of as udde nl oss of pressure, e.g. if th et ir ei s
penetrated by af oreign object. In th ee vent of a
sudde nl oss of pressure, brin gt he vehicl etoa
halt by braking carefully. Avoid abrup ts te ering
movements.
The function of th et ir ep ressur el oss warning
system is limite dord elaye di f:R
snow chain sa re mounte dony our vehicle's
tires .R
road condition sa re wintry.R
you are driving on san dorg ravel.R
you adopt av er ys port yd riving style (corner-
ing at high speeds or driving wit hh igh rates of
acceleration). R
you driv ew it hah eav yl oad.
Restarting th et ir ep re ssure loss warn-
ing system Restart th et ir ep ressur el oss warning system if
you have :R
changed th et ir ep ressur eR
changed th ew heels or tiresR
mounte dn ew wheels or tiresX
Before restarting ,m ak es ur et ha tt he tire
pressures are set properly on all four tires for
th er espective operating conditions.
The recommended tire pressur ec an be foun d
on th eT ir ea nd Loading Information placard
on th eB -p illar .A dd itionally, at ir ep ressur e
table is attached to th ef uel filler flap .T he tire
pressur el oss warning system can only giv e
reliable warning sify ou have set th ec orrect
tire pressure. If an incorrec tt ir ep ressur ei s
set ,t he se incorrec tv alue sw ill be monitored.X
Als oo bserv et he note sint he section on tire
pressures ( Y
page 263).X
Mak es ur et ha tt he SmartKey is in position H
in th ei gnition loc k( Y
page 116). X
Press th e Y or e butto nont he steering
whee lt os elect th e Serv. menu.X
Press th e c or d butto ntos elect
Tir eP ressure . X
Press th e v button.
The Run Fla tI ndicator Active Press
'OK 'toR estar t message appear sint he
multifunction display.
If you wish to confirm th er estart :X
Press th e v button.
The Tir eP ressure Now OK? message
appear sint he multifunction display. X
Press th e c or d butto ntos elect Yes .X
Press th e v button.
The Run Fla tI ndicator Restarted mes -
sage appear sint he multifunction display.
Afte rat ea ch-in period, th et ir ep ressur el oss
warning system will monitor th es et tire pres-
sures of all four tires .
If you wish to cancel th er estart :X
Press th e 8 button.
or X
If th e Tir eP ressure Now OK? message
appears, use th e c or d butto nt o
select Cancel . X
Press th e v button.
The tire pressur ev alue ss to re datt he last
restar tw ill continue to be monitored.
Tire pressure monitor
General notes If at ir ep ressur em onitor is installed, th ev ehi-
cle's wheels hav es ensor st ha tm onitor th et ir e
pressures in all four tires .T he tire pressur em on -
itor warn sy ou if th ep ressur ed rops in on eo r
mor eoft he tires .T he tire pressur em onitor only
function sift he corresponding sensor sa re
installed in all wheels.
Information on tire pressures is displayed in th e
multifunction display. Afte raf ew minute so f
driving ,t he curren tt ir ep ressur eofe ac ht ir ei s
shown in th e Serv. men uoft he multifunction
display. Tire pressure 267
Wheels and tires Z

Example: current tire pressure display
For informatio nont he message display, refer to
the "Checking the tire pressure electronically"
sectio n( Y
page 269).
Important safety notes
G WARNING
Each tire ,i ncluding the spar e( if provided),
shoul dbec hecked at leas to nce am onth
when col da nd inflate dtot he pressure rec-
ommended by the vehicl em an ufacturer on
the Tire and Loading Informatio np la card on
the driver's door B-pillar or the tire pressure
labe lont he insid eoft he fuel fille rf lap. If your
vehicl eh as tire sofad if ferent size tha nt he
size indicated on the Tire and Loading Infor-
matio np la card or the tire pressure label, you
shoul dd et ermine the prope rt ire pressure for
thos et ires.
As an adde ds af ety feature, your vehicl eh as
been equipped with at ire pressure monitoring
system (TPMS )t ha ti llum inate sal ow tire pres-
sure telltale when one or mor eofy ou rt ires
ar es ig nificantl yu nderinflated .A ccordingly,
when the lo wt ire pressure telltale illuminates,
yo us houl ds top and check your tire sass oon
as possible, and inflate the mtot he proper
pressure. Driving on as ig nificantl yu nderin-
flated tire causes the tire to overheat and can
lead to tire failure. Underinflatio na ls o
reduce sf ue le fficiency and tire trea dl if e, and
ma ya ff ect the vehicle's handling and stop-
ping ability.
Please note tha tt he TPMS is not as ubst itute
for prope rt
ire ma intenance ,a nd it is the driv-
er' sr esponsibility to maintain correct tire
pressure, eve nifu nderinflatio nh as not
reache dt he level to trigge ri llum ination of the
TPMS lo wt ire pressure telltale. Your vehicl eh as also been equipped with a
TPMS malfunctio ni ndicator to indicate if the
system is not operating properly .T he TPMS
malfunctio ni ndicator is combine dw it ht he
lo wt ire pressure telltale .W he nt he system
detects am al function, the warning lamp will
flash for approximately am inute and then
remai nc ontinuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists.
When the malfunctio ni ndicator is illuminated,
the system ma yn ot be able to detect or signal
lo wt ire pressure as intended. TPMS malfunc-
tions ma yo ccu rf or av ar iety of reasons,
including the installatio nofi ncompatible
replacement or alternate tire sorw heel so n
the vehicl et ha tp revent the TPMS fro mf un c-
tioning properly .A lway sc heck the TPMS mal-
functio nt elltale after replacing one or more
tire sorw heel sony ou rv ehicl etoe nsur et hat
the replacement or alternate tire sa nd wheels
allo wt he TPMS to continue to functio np rop-
erly.
It is the driver's responsibility to set the tire
pressure to tha tr ecommende df or col dt ires
which is suitabl ef or the operating situation
( Y
page 263) .N ote tha tt he correct tire pressure
for the curre nt operating situatio nm u s tf irst be
taught-i ntot he tire pressure monitor. If as ub -
stantia ll os sofp ressure occurs, the warning
threshold for the warning message is aligned to
the taught-i nr eference values. Restart the tire
pressure monitor after adjusting the pressure of
the col dt ire s( Y
page 270). The current pres-
sures ar es av ed as new reference values. As a
result, aw ar ning message will appear if the tire
pressure drops significantly.
The tire pressure monitor does not warn yo uo f
an incorrectly set tire pressure. Observe the
note sont he recommende dt ire pressure
( Y
page 263).
The tire pressure monitor is not able to warn you
of as udde nl os sofp ressure, e.g .ift he tire is
penetrated by af oreign object. In the event of a
sudden loss of pressure, bring the vehicl etoa
halt by braking carefully. Avoi da brup ts teering
movements.268
Tire pressure
Wheel sa nd tires

The tire pressure monitor has ay ellow warning
lamp in the instrument cluster for indicating
pressure loss or am alfunction. Whether the
warning lamp flashes or lights up indicates
whether at ire pressure is too low or the tire
pressure monitor is malfunctioning: R
if the warning lamp is lit continuously, the tire
pressure on one or more tires is significantly
too low. The tire pressure monitor is not mal-
functioning. R
if the warning lamp flashes for approximately
am inute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
In addition to the warning lamp, am essage
appears in the multifunction display .O bserve
the information on display messages
( Y
page 196).
It may take up to ten minutes for am alfunction
of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after af ew minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at ag as station with ap ressure gage. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a
pressure gage are higher than those shown by
the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interferenc ef rom radio transmit-
ting equipment (e.g. radio headphones, two-way
radios) that may be being operated in or near the
vehicle.
Checking the tire pressur ee lectroni-
cally X
Make sure that the SmartKey is in position H
( Y
page 116) in the ignition lock. X
Press the Y or e button on the steering
wheel to select the Serv. menu.X
Press the c or d button to select
Tire Pressure .X
Press v .
The current tire pressure of each tire is shown
in the multifunction display. If the vehicle has been parked for over
20 minutes, the Tire pressure will be
displayed after driving af ew minutes
message appears.
After at each-in process, the tire pressure mon-
itor automatically detect sn ew wheels or new
sensors. As long as ac lear allocation of the tire
pressure value to the individual wheels is not
possible, the Tire Pressure Monitor Active
display message is shown instead of the tire
pressure display .T he tire pressures are already
being monitored.
If an emergenc ys pare wheel is mounted, the
system may continue to show the tire pressure
of the wheel that has been removed for af ew
minutes. Be aware that the value displayed for
the position where the emergenc ys pare wheel
is fitted is not the same as the current tire pres-
sure of the emergenc ys pare wheel.
Tire pressur em onitor warning mes-
sages The tire pressure monitor detect sap ressure
loss in one or more tires: R
If the tire pressure monitor detect sap ressure
loss in one or more tires, aw arning message
is shown in the multifunction display .T he yel-
low tire pressure warning lamp then lights up. R
If the Please Correct Tire Pressure
message appears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunit ya rises. R
If the Check Tires message appears in the
multifunction display ,t he tire pressure in at
least one tire has dropped significantly. The
tires must be checked. R
If the Warning Tire Malfunction message
appears in the multifunction display ,t he tire
pressure in at least one tire has dropped sud-
denly. The tires must be checked.
Observe the instructions and safety notes in the
display messages in the "Tires" section
( Y
page 196).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displayed for the
wrong positions for as hort time. This is rectified
after af ew minutes of driving, and the tire pres-
sures are displayed for the correc tp ositions.Tir ep re ssure 269
Wheels and tires Z