tires MERCEDES-BENZ C CLASS 2019 User Guide

Rfrequent operation in mountainousterrain oron poorroad surfaces
Rwhenthe engine is often leftidlingfor longperiods
Roperation in particularly dusty conditionsand/or if air-recirculation mode is frequentlyused
Inthese or similar operating conditions, havetheinterior airfilter, engine air cleaner, engine oiland oilfilteretc.changed more frequently. Thetires must bechecked more frequently ifthevehicle is operated under increased loads.Fur‐ther information can be obtained at aqualifiedspecialistworkshop.
Battery disconnection periods
The ASSYST PLUS service interval displaycan only calculatethe service due datewhenthe batteryis connected.
Notedownthe service due date displayed onthe instrument display before disconnectingthe battery (page 351).
Engine compartment
Opening/closingthe hood
\nWARNINGRisk of accident ifthe enginehood is unlatched while driving
An unlocked engine hood may open up whenthevehicle is in motion and blockyour view.
Never unlatchthe engine hood whiledriving.
Beforeevery trip, ensurethattheengine hood is latched.
\nWARNINGRisk of accident and injurywhen opening and closingthe enginehood
When opening or closingthe engine hood, itmay suddenly drop intothe end position.
There is arisk of injuryfor anyone intheengine hood'srange of movement.
Only open or closethe engine hoodwhenthere are no persons intheengine hood'srange of movement.
\nWARNINGDanger of burns when open‐ingthe hood
Ifyou openthe hood whenthe engine hasoverheated or during afireinthe enginecompartment,you could come into contactwith hotgases orother escaping operatingfluids.
Before openingthe hood, allowtheenginetocool down.
Intheevent of afireinthe engine com‐partment,keepthe hood closed andcallthefireservice.
\nWARNINGRisk of injuryduetomovingparts
Certain components inthe engine compart‐ment may continuetomoveor suddenlymoveagaineven afterthe ignition has beenswitched off, e.g.the coolerfan.
Makesure ofthefollowing before performingtasks inthe engine compartment:
Switchthe ignition off.
352Maintenance and care

Cleaning and care
Information onwashingthevehicle in a carwash
\nWARNINGRisk of accident duetoreduced braking effect afterwashingthevehicle
The braking effect isreduced afterwashingthevehicle.
Afterthevehicle has beenwashed,brake carefully while paying attentiontothe traffic conditions untilthe brakingeffect has been fullyrestored.
NOTEDamageduetounsuitable carwash
Before driving into a carwash makesurethatthe carwash is suitableforthevehicle dimensions.
Ensurethere is sufficient ground clear‐ance betweenthe underbody andtheguiderails ofthe carwash.
Ensurethatthe clearance width ofthecarwash, in particularthe width oftheguiderails, is sufficient.
Toavoid damageto yourvehicle when using acarwash, ensurethefollowing beforehand:
RActive Distance AssistDISTRONIC andtheHOLD function are deactivated.
Rthe 360° Camera ortherear view camera isswitched off.
Rthe side windowsand sliding sunroof arecompletelyclosed.
Rthe blowerfortheventilation/heating isswitched off.
Rthe windshield wiper switch is in positionZ.
Rin carwashes with a conveyor system: neu‐tral\\is engaged.
Rthe SmartKeyis at a minimum distance of10ft(3 m)awayfromthevehicle,otherwisethe trunk lid could open unintentionally.
Ifyouwould liketoleavethevehicle while itis beingwashed, make surethe SmartKeyis
located inthevehicle. The]gear isother‐wise automatically engaged.
If, afterthe carwash,youremovethewaxfromthe windshield and wiperrubbers,thiswill prevent smearing andreduce wipernoise.
Information on using a powerwasher
\nWARNINGRisk of accident when usinghigh-pressure cleaning equipment withround-spraynozzles
Thewater jet from around-spraynozzle (dirtgrinder) may cause damagetotires and sus‐pension componentsthat is not visible.
Components damaged inthisway mayfailunexpectedly.
Do not use high-pressurecleaningequipment withround-spraynozzlestocleanyourvehicle.
Damaged tires or suspension compo‐nents must bereplaced immediately.
Maintenance and care359

Toavoid damageto yourvehicle, observethefol‐lowing when using a powerwasher:
Rkeepthe SmartKeyat least10ft(3 m)awayfromthevehicle. Otherwisethe trunk lidcould open unintentionally.
Rmaintain a distance of at least11.8 in(30 cm)tothevehicle.
Rvehicles with decorativefoil:parts ofyourvehicle are covered with a decorativefoil.Maintain a distance of at least27.6 in(70 cm) betweenthefoil-covered parts ofthevehicle andthe nozzle ofthe powerwasher.Movethe powerwasher nozzle around whilst
cleaning. Thewatertemperature ofthepowerwasher must notexceed140 °F(60 °C).
Robservethe information onthe correct dis‐tance inthe equipment manufacturer's oper‐ating instructions.
Rdo not pointthe nozzle ofthe powerwasherdirectly at sensitive parts such as tires, slits,electrical components, batteries, light bulbsandventilation slots.
Washingthevehiclebyhand
Observethe legalrequirements, e.g. in a numberof countries,washingbyhand is only permittedin specially designatedwash bays.
Use a mild cleaning agent, e.g. car shampoo.
Washthevehicle with lukewarmwater usinga soft car sponge. When doing so, do notexposethevehicletodirect sunlight.
Carefully hosethevehicle off withwater anddry using achamois.Takecare nottopointthewater jet directlytowardsthe air inletgrille.
360Maintenance and care

Flat tire
Notes onflat tires
\nWARNINGRisk of accident duetoaflattire
Aflat tire severelyaffectsthe drivingcharac‐teristics aswell asthesteering and brakingofthevehicle.
Tires withoutrun-flatcharacteristics:
Do not drive on with aflat tire.
Changetheflat tire immediately with anemergency sparewheel or spare wheel.Alternatively,consult aqualified spe‐cialistworkshop.
Tires withrun-flatcharacteristics:
Observethe information andwarningnotes on MOExtended tires (run-flattires).
Intheevent of aflat tire,thefollowing optionsareavailable depending onyourvehicle's equip‐ment:
RVehicles with MOExtended tires:it is pos‐sibletocontinuethe journeyfor a shortperiod of time. Make sureyou observethenotes on MOExtended tires (run-flat tire)(page370).
RVehicles with a TIREFIT kit:you canrepairthe tires sothat it is possibletocontinuethejourneyfor a short period of time.Todothis,usethe TIREFIT kit (page371).
RVehicles with Mercedes me connect:youcan make a callforRoadside Assistance viatheoverhead control panel inthe case of abreakdown (page319).
RAllvehicles:changethe wheel(page415).
Notes on MOExtended tires (run-flat tire)
\nWARNINGRisk of accident when drivingin emergency mode
When driving in emergency mode,the han‐dlingcharacteristics are impaired. e.g. whencornering, when acceleratingstronglyandwhen braking.
Do notexceedthe permissible maxi‐mum speedfor MOExtended tires.
Avoid any abruptsteering and drivingmaneuvers aswell as drivingoverobstacles (curbs, pot holes, off-road).This applies, in particular,toa loadedvehicle.
Stop driving inthe emergency mode ifyou notice:
Rbanging noise
Rvehicle vibration
Rsmoke which smells likerubber
Rcontinuous ESP®intervention
Rcracksin tire sidewalls
37 0Breakdown assistance

After driving in emergency mode havetherimscheckedbyaqualified special‐istworkshop withregardtotheir furtheruse.
The defective tire must bereplaced ineverycase.
WithMOExtended tires (run-flat tire),you cancontinuetodriveyourvehicleeven ifthere is atotal loss of pressure in one or more tires. How‐ever,the tire affected must not show any clearlyvisible damage.
You canrecognize MOExtended tiresbytheMOExtended marking which appears onthe sidewall ofthe tire.
Vehicles with tire pressure losswarning sys‐tem:MOExtended tires may only be used in con‐junction withan activated tire pressure losswarning system.
Vehicles with tire pressure monitoring sys‐tem:MOExtended tires may only be used in con‐junction withan activated tire pressure monitor‐ing system.
If a pressure losswarning message appears inthe multifunction display,proceed asfollows:
RCheckthe tirefor damage.
RIf driving on, observethefollowing notes.
Driving distance possible in emergencymode after the pressure losswarning:
Load condition Driving distance pos‐sible in emergencymode
Partially laden50 miles (80 km)
Fully laden19miles (30 km)
The driving distance possible in emergencymode mayvarydepending onthe drivingstyle.Observethe maximum permissible speed of50mph (80 km/h).
If a tire has goneflat and cannot bereplacedwith an MOExtended tire,you can use astand‐ard tire as atemporary measure.
TIREFIT kitstoragelocation
Mercedes-AMGvehicles:observethe notes inthe Supplement. Otherwise,you mayfailtorec‐ognize dangers.
The TIREFIT kit is located underthe trunkfloor.
1Tiresealant bottle
2Tireinflation compressor
Usingthe TIREFIT kit
Requirements:RTiresealant bottle
RTIREFITsticker
Breakdown assistance371

If, afterten minutes, a tire pressure of200 kPa (2.0 bar/29 psi) has not been ach‐ieved:
Switch offthe tire inflation compressor.
Unscrewthefilling hose fromthevalve ofthefaulty tire.
Please notethat tire sealant may leak out whenunscrewingthefilling hose.
Veryslowly driveforwards orreverse approx‐imately 33ft(10 m).
Pump upthe tire again.After a maximum often minutesthe tirepressure must be at least 200 kPa (2.0 bar/29 psi).
\nWARNINGRisk of accident duetothespecified tire pressure not beingreached
Ifthe specified tire pressure is notreachedafterthe specified time,the tire istoo badlydamaged. The tire sealant cannotrepairthetire inthis instance.
Damaged tires and a tire pressurethat istoolow can significantly impair braking and han‐dlingcharacteristics.
Do not continue driving.
Consult aqualified specialistworkshop.
If, afterten minutes, a tire pressure of200 kPa (2.0 bar/29 psi) has been achieved:
\nWARNINGRisk of accident from drivingwithsealed tires
A tiretemporarily sealed with tire sealantimpairs drivingcharacteristics and is notsuitablefor higher speeds.
Adaptyour drivingstyle accordinglyanddrive carefully.
Do notexceedthe maximum speedlimit with a tirethat has beenrepairedusing tire sealant.
Observethe maximum permissible speedfora tire sealed with tire sealant 50mph(80 km/h).
Affixthe upper section ofthe TIREFITstickertothe instrument cluster in a location whereit will be easilyseenbythe driver.
NOTEStaining causedbyleaking tiresealant
After use,excess tire sealant may leak outfromthefilling hose.
Therefore, placethefilling hose intheplastic bagthat containedthe TIREFITkit.
ENVIRONMENTALNOTEEnvironmentalpollution causedbyenvironmentally irre‐sponsible disposal
Tiresealant contains pollutants.
Havethe tire sealant bottle disposed ofprofessionally,e.g. at an authorizedMercedes-Benz Center.
Switch offthe tire inflation compressor.
Unscrewthefilling hose fromthevalve ofthefaulty tire.
374Breakdown assistance

Stow the tire sealant bottle andthe tire infla‐tion compressor.
Pullawayimmediately.
Stop driving after approximatelyten minutesandcheckthe tire pressure usingthe tireinflation compressor.The tire pressure must now be at least130 kPa (1.3 bar/19 psi).
\nWARNINGRisk of accident duetothespecified tire pressure not beingreached
Ifthe specified tire pressure is notreachedafter a brief drive,the tire istoo badly dam‐aged. The tire sealant cannotrepairthe tireinthis instance.
Damaged tires and tire pressurethat istoolow can significantly impairthe braking prop‐erties andthe handlingcharacteristics.
Do not continue driving.
Consult aqualified specialistworkshop.
In cases such asthe one mentioned above, con‐tact an authorized Mercedes-Benz Center. Or
call 1-800-FOR-MERCedes (inthe USA) or1-800-387-0100(in Canada).
Correctthe tire pressure if it isstill at least130 kPa (1.3 bar/19 psi). SeetheTireandLoading Information placard onthe driver'sside B‑pillar orthe tire pressuretable inthefuelfillerflapforvalues.
Toincreasethe tire pressure:switchonthe tire inflation compressor.
Toreduce the tire pressure:press pressurerelease button1nexttopressuregauge2.
Whenthe tire pressure is correct, unscrewthefilling hose fromthevalve ofthe sealedtire.
Screwthevalve cap ontothevalve ofthesealed tire.
Pullthe tire sealant bottle out ofthe tireinflation compressor. Pressthe lockingtabsontheyellow captogethertodothis.Thefilling hosestays onthe tire sealant bot‐tle.
Drivetothe nearestqualified specialistwork‐shop and havethe tire, tire sealant bottle andfilling hosereplacedthere.
Breakdown assistance375

Notes on noise or unusual handlingcharac‐teristics
While driving, pay attentiontovibrations, noisesand unusual handlingcharacteristics, e.g. pullingtoone side. This may indicatethatthe wheels ortires are damaged. Ifyou suspectthat a tire isdefective,reduceyour speed immediately.Stopthevehicle as soon as possibletocheckthewheels and tiresfor damage. Hidden tire dam‐age could also be causingthe unusual handlingcharacteristics. Ifyoufind no signs of damage,havethe tires and wheelschecked at aqualifiedspecialistworkshop.
Notes onregularlyinspecting wheels andtires
\nWARNINGRisk of accident from dam‐aged tires
Damaged tires can cause tire pressure loss.
As aresult,you could lose control ofyourvehicle.
Checkthe tiresregularlyfor signs ofdamageandreplace any damaged tiresimmediately.
\nWARNINGRisk of aquaplaning duetoinsufficient tire tread
Insufficient tire tread willresult inreducedtire grip. The tire tread is no longer abletodissipatewater.
This meansthat in heavyrain or slushtherisk ofhydroplaning is increased, in particu‐lar ifvehicle speed is not adaptedtosuittheconditions.
Ifthe tire pressure istoo high ortoo low,tires mayexhibit different levels ofwear atdifferent locations onthe tire contact sur‐face.
Thus,you shouldregularlycheckthetread depth andthe condition ofthe tirecontact surface acrossthe entire widthof all tires.
Minimum tread depthfor:
RSummer tires:

Tirepressure
Notes on tire pressure
\nWARNINGRisk of accident duetoinsuf‐ficient orexcessive tire pressure
Underinflated oroverinflated tires posethefollowingrisks:
RThe tires may burst, especially astheload andvehicle speed increase.
RThe tires maywearexcessively and/orunevenly,which maygreatlyimpair tiretraction.
RThe drivingcharacteristics, aswell assteering and braking, may be greatlyimpaired.
Comply withtherecommended tirepressure andcheckthe tire pressure ofall tires includingthe spare wheelregu‐larly:
Rat least once a month
Rwhenthe loadchanges
Rbefore embarking on a longer journey
Rif operating conditionschange, e.g. off-road driving
Adjustthe tire pressure as necessary.
Driving withtire pressurethat istoo high ortoolow can:
RShortenthe service life ofthe tires.
RCause increased tire damage.
RAdversely affect drivingcharacteristics andthus driving safety,e.g. dueto hydroplaning.
\nWARNINGRisk of an accident duetoinsufficient tire pressure
Tires with pressurethat istoo low canover‐heat and burstas aresult.
In addition,theyalso suffer fromexcessiveand/or irregularwear, which can significantlyimpairthe braking properties andthe han‐dlingcharacteristics.
Avoidexcessively low tire pressures inallthe tires, includingthe spare wheel.
Tirepressure which istoo low can cause:
RTiredefects as aresult ofoverheating
RImpaired handlingcharacteristics
RIrregularwear
RIncreased fuel consumption
\nWARNINGRisk of accident fromexces‐sive tire pressure
Tires withexcessively high pressure canburstbecausetheyare damaged more easilybyhighwayfill, pot holesetc.
In addition,theyalso suffer from irregularwear, which can significantly impairthe brak‐ing properties andthe handlingcharacteris‐tics.
Avoidexcessively high tire pressures inallthe tires, includingthe spare wheel.
Excessively high tire pressure canresult in:
RIncreased braking distance
RImpaired handlingcharacteristics
RIrregularwear
392Wheels and tires

RImpaired driving comfort
RSusceptibilitytodamage
\nWARNINGRisk of accident causedbyrepeated drop in tire pressure
Ifthe tire pressure dropsrepeatedly,thewheel,valve or tire may be damaged.
Insufficient tire pressure can causethe tirestoburst.
Inspectthe tirefor signs offoreignobjects.
Check whetherthe wheel orvalve has aleak.
Ifyou are unabletorectifythe damage,contact aqualified specialistworkshop.
You canfind information on tire pressureforthevehicle'sfactory-installed tires onthefollowinglabels:
RTireand Loading Information placard ontheB‑pillar ofyourvehicle (page 399).
RTirepressuretable onthe inside ofthe fuelfillerflap (page 393).
Observethe maximum tire pressure(page 406).
Use a suitable tire pressuregaugetocheckthetire pressure. The outer appearance of a tiredoes not permit anyreliable conclusion aboutthe tire pressure.
Vehicles with a tire pressure monitoring sys‐tem:You can alsocheckthe tire pressure usingthe on-board computer.
Only correct tire pressure whenthe tires arecold. Conditionsfor cold tires:
RThevehicle has been parked withthe tiresout of direct sunlightfor at leastthree hours.
RThevehicle has traveled lessthan 1 mile(1.6 km).
Arise inthe tiretemperature of18°F (10 °C)increasesthe tire pressurebyapprox.10kPa(0.1 bar/1.5 psi).Takethis into account whencheckingthe tire pressure ofwarmtires.
The tire pressure recommendedfor increasedload/speed inthe tire pressuretable can affecttheride comfort.
\nWARNINGRisk of accident from unsuita‐ble accessories onthe tirevalves
Ifyou mount unsuitable accessories ontotirevalves,the tirevalves may beoverloaded andmalfunction, which can cause tire pressureloss.Tirepressure monitoring systemsforretrofitting will causethe tirevalvetoremainopen. This can alsoresult in tire pressureloss.
Only screwstandardvalve caps orvalvecaps specifically approvedbyMercedes-Benzforyourvehicle ontothe tirevalve.
Tirepressure table
The tire pressuretable is onthe inside ofthefuelfillerflap.
The data shown inthe images isexampledata.
Wheels and tires393