service MERCEDES-BENZ C CLASS 2019 Service Manual

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ASSYST PLUS service interval display
Function ofthe ASSYST PLUS service intervaldisplay
The ASSYST PLUS service interval display ontheInstrument Display provides information ontheremaining time or distance beforethe nextservice due date.
You can hidethis service message usingtheback button onthe left-hand side ofthesteeringwheel.
Depending on howthevehicle is used,theASSYST PLUS service interval display mayshortenthe service interval, e.g. inthefollowingcases:
RMainly short-distance driving
RWhenthe engine is often leftidlingfor longperiods
RIntheevent of frequent coldstart phases
Mercedes-Benzrecommendsavoiding suchoperating conditions.
You can obtain further information concerningthe servicing ofyourvehicle from aqualified
specialistworkshop, e.g. an authorizedMercedes-Benz Center.
Displayingthe service due date
On-board computer:
ServiceASSYST PLUS
The next service due date is displayed.
Toexitthe display:pressthe back buttononthe left-hand side ofthesteering wheel.
Make suretoobservethefollowing furtherrela‐ted subject:
ROperatingthe on-board computer(page 228).
Information onregular maintenancework
NOTEPrematurewearthroughfailuretoobserveservice due dates
Serviceworkwhich is not carried out attheright time or incompletelycan leadtoincreasedwear and damagetothevehicle.
Always observethe prescribed serviceintervals.
Always havethe prescribed serviceworkcarried out at aqualified specialistworkshop.
Special servicerequirements
The prescribed service interval is based on nor‐mal operation ofthevehicle. Maintenanceworkwill needtobe performed more often ifthevehi‐cle is operated under arduous conditions orincreased loads.
The ASSYST PLUS service interval display is onlyan aid. The driver ofthevehicle bearsresponsi‐bility asregardstowhether maintenanceworkneedstobe performed more oftenthan speci‐fied based onthe actual operating conditionsand/or loads.
Examples of arduous operating conditions:
Rregular city driving with frequent intermedi‐atestops
Rmainly short-distance driving
Maintenance and care351

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

ROil leveltoo high: oil level is above2.
Ifthe oil level istoo low,add1.1 US qt(1 liter) of engine oil.
Ifthe oil level istoo high, drain offexcessengine oil. Consult aqualified specialistworkshop.
Checkingthe engine oil level usingthe on-board computer
RequirementsThe engine must havean oil level sensor. If not,the engine oil level can bechecked only withtheoil dipstick (page 354).
The engine oil level is determined during driving.Determiningthe engine oil level cantakeupto30 minutes with a normal drivingstyle andevenlonger with an active drivingstyle.
In ordertoreceivearesult asquickly as possi‐ble:
RWarmupthe engine
RParkthevehicle on a level surface
RLeavethe enginerunning at idling speed
On-board computer:
ServiceEngine Oil Level
You will see one ofthefollowing messages onthe multifunction display:
RMeasuring Engine Oil Level...: measurementofthe oil level is notyet possible.
Repeattherequest after a maximum of30 minutes driving.
REngine Oil Level OKandthe bar displayforindicatingthe oil level onthe multifunctiondisplay is green and is between "min" and"max":the oil level is correct.
REngine Oil Level Add 1.0 landthe bar displayfor indicatingthe oil level onthe multifunc‐tion display is orange and is below "min":
Add1.1 US qt (1 l) engine oil.
RReduce Engine Oil Levelandthe bar displayfor indicatingthe oil level onthe multifunc‐tion display is orange and is above"max":
Drain offexcess engine oilthat has beenadded. Consult aqualified specialistwork‐shop.
RFor Engine Oil Level Switch Ignition On:
Switch onthe ignitiontocheckthe engine oillevel.
REngine Oil Level System Inoperative: sensorfaulty or not inserted.
Consult aqualified specialistworkshop.
REngine Oil Level System Currently Unavail.:
Closethe hood.
Adding engine oil
\nWARNINGRisk of burns from hot com‐ponent parts inthe engine compartment
Certain components inthe engine compart‐ment can beveryhot, e.g.the engine,theradiator and parts oftheexhaust system.
Allowthe enginetocool down and onlytouch component parts described inthefollowing.
Maintenance and care355

\nWARNINGRisk offireand injury fromengine oil
If engine oil comes into contact withhotcomponent parts inthe engine compart‐ment, it may ignite.
Make surethat no engine oil is spillednexttothefiller opening.
Allowthe enginetocool off andthor‐oughly cleanthe engine oil from compo‐nent parts beforestartingthevehicle.
NOTEEngine damagecausedbyanincorrect oilfilter, incorrect oil or addi‐tives
Do not use engine oils or oilfilterswhich do not correspondtothe specifi‐cationsexplicitly prescribedfortheservice intervals.
Do not alterthe engine oil or oilfilter inordertoachievelongerchange intervalsthan prescribed.
Do not use additives.
Followthe instructions inthe serviceinterval displayregardingthe oilchange.
NOTEDamagecausedbyaddingtoomuch engine oil
Too much engine oil can damagethe engineorthe catalytic converter.
Haveexcess engine oilremoved at aqualified specialistworkshop.
Turncap1counter-clockwise andremoveit.
Add engine oil.
Replace cap1and turn it clockwise asfaras it will go.
Checkthe oil level again (page 354).
356Maintenance and care

Checking coolant level
\nWARNINGRisk of burns from hot com‐ponent parts inthe engine compartment
Certain components inthe engine compart‐ment can beveryhot, e.g.the engine,theradiator and parts oftheexhaust system.
Allowthe enginetocool down and onlytouch component parts described inthefollowing.
\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 scalding from hotcoolant
The engine cooling system is pressurized,particularly whenthe engine iswarm. Ifyouopenthe cap,you could be scaldedbyhotcoolant spraying out.
Letthe engine cool down before open‐ingthe cap.
When openingthe cap,wear protectivegloves and safetyglasses.
Openthe cap slowlytorelease pres‐sure.
Parkthevehicle on a level surface.
Checkthe coolanttemperature display intheinstrument cluster.The coolanttemperature must be below158 °F (70 °C).
Slowly turn cap1counter-clockwisetorelieve overpressure.
Maintenance and care357

Continue turning cap1counter-clockwiseandremoveit.
The coolant level is correct:
RIfthe engine is cold, uptomarker bar2
RIfthe engine iswarm, upto0.6 in (1.5 cm)over marker bar2
If necessary,add coolantthat has beenapprovedbyMercedes-Benz.RFurther information on coolant(page 429).
Addingwasher fluidtothe windshieldwasher system
\nWARNINGRisk of burns from hot com‐ponent parts inthe engine compartment
Certain components inthe engine compart‐ment can beveryhot, e.g.the engine,theradiator and parts oftheexhaust system.
Allowthe enginetocool down and onlytouch component parts described inthefollowing.
\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.
\nWARNING‑ Risk offireand injury fromwindshieldwasher concentrate
Windshieldwasher concentrate is highlyflammable. It could ignite if it comes intocontact withhot engine component parts ortheexhaust system.
Make surethat no windshieldwasherconcentrate spills out nexttothefilleropening.
Removecap1bythetab.
Addwasherfluid.
Keepingthe air-water duct free
Keepthe area betweenthe hood andthewindshield free of deposits, e.g. ice, snowand leaves.
358Maintenance and care

Observethefollowing information:
CleaningAvoiding damagetothe decorativefoil
RFor cleaning, use plenty ofwater and a mild cleaning agent withoutadditives or abrasivesubstances, e.g. a car shampoo approvedforMercedes-Benz.
RRemovedirt immediately, where possible, whilstavoidingrubbingtoo hard. There isotherwise arisk of damagingthe decorativefoilirreparably.
RIfthere is dirt onthefinish or ifthe decorativefoil is dull: usethePaint Cleanerrecommended and approvedfor Mercedes-Benz.
RInsectremains: soak with insectremover andrinse offthe treatedareas afterwards.
RBird droppings: soak withwater andrinse off afterwards.
RTopreventwaterstains, dry afoil-wrappedvehicle with a soft,absorbent clothaftereverycarwash.
RThe service life and color of decorativefoils are impairedby:
-sunlight
-temperature, e.g. hot air blower
-weather conditions
-stonechippings and dirt
-chemical cleaning agents
-oily products
RDo not use polish on matte decorativefoil.Polishing will havethe effectof shiningthefoil-wrapped surface.
RDo not treat matte orstructured decorativefoils withwax.Permanentstains may occur.
Scratches, corrosive deposits, areas affectedbycorrosion and damage causedbyincorrect carecannot alwaysbe completelyrepaired. In suchcases, visit aqualified specialistworkshop.
You can obtain more information on care andcleaning products fromthe manufacturer.
Inthe case offoil-wrapped surfaces, optical dif‐ferences may occur betweenthe surfacesthatwerenot protectedbya decorativefoil afterremoving a decorativefoil.
Haveworkorrepairstodecorativefoils car‐ried out at aqualified specialistworkshop,e.g. in an authorized Mercedes-Benz Center.
Maintenance and care363

Ifthe indicator/warning lamps inthe instrumentcluster do not light up at lowtemperatures, it isverylikelythatthe discharged battery has fro‐zen. Inthis caseyou may neither jump-startthevehicle norchargethe battery.
The service life of a batterythat has beenthawed may be dramatically shortened. Thestartingcharacteristics may be impaired, espe‐cially at lowtemperatures.
It isrecommendedthatyou haveathawed bat‐terychecked at aqualified specialistworkshop.
AllvehiclesPlug-inhybrid:observethe notes inthe Supple‐ment. Otherwise,you mayfailtorecognize dan‐gers.
NOTEDamagecausedbynumerous orextended attemptstostartthe engine
Numerous orextended attemptstostarttheengine may damagethe catalytic converterduetonon-combusted fuel.
Avoid numerous andextended attemptstostartthe engine.
Observethefollowing points duringstartingassistance and whenchargingthe battery:
ROnly use undamaged jumper cables/charg‐ing cables with a sufficient cross-section andinsulatedterminal clamps.
RNon-insulated parts oftheterminal clampsmust not come into contact withother metalparts whilethe jumper cable/charging cableis connectedtothe battery/jump-startcon‐nection point.
RThe jumper cable/charging cable must notcome into contact withany parts which maymovewhenthe engine isrunning.
RAlways make surethat neitheryou northebattery is electrostaticallycharged.
RKeepawayfromfireand openflames.
RDo not leanoverthe battery.
Observethe additionalfollowing points whenchargingthe battery:
ROnly use batterychargerstested andapprovedfor Mercedes-Benz.
RReadthe batterycharger's operating instruc‐tions beforechargingthe battery.
Observethe additionalfollowing points duringstarting assistance:
RStarting assistance may only be providedusing batteries with a nominalvoltage of12V.
RThevehicles must nottouch.
RGasoline engine:Onlyacceptstarting assis‐tance ifthe engine andexhaust system arecold.
Starting assistance andchargingthe12 Vbattery
Requirements:RThevehicle is secured withthe electric park‐ing brake.
RAutomatic transmission:The transmissionis in position].
RThe ignition and all electrical consumers areswitched off.
RThe hood is open.
Breakdown assistance37 9

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