2020 MERCEDES-BENZ SLC ROADSTER engine

Warning/
indic ator
lamp 00510051
Sign altype
Poss iblec ause s/cons equen cesand 0050 0050
Sol utions X
Make surethattheairsup plytothe engine radiator isnot blocked ,e.g. by
snow, slush orice.
X Ifthe coola nttempera turegage isbel ow the Hmarking (Ypag e169) ,drive
on tothe next qualified speci alist worksho p.
X Avoid heavyloa dson the engine asyou doso, e.g. drivinginmountai nouster-
rain andstop-and-go traffic. Drivi
ngsystems Warning/
indic ator
lamp 00510051
Sign altype
Poss iblec ause s/cons equen cesand 0050 0050
Sol utions 00BA
0051
The reddista ncewarning lamp lights upwhi lethe vehicl eisinm otion. A
war ning tone alsos ound s.
You areapproachi ngavehicl e,ap ede strian oras tationa ryobstacl einy ourline
of travel attoo high aspee d.
X Be prepa redtobrake immed iately.
X Pay carefu lattention tothe traffic situation. Youmay have tobrake ortake
evasi veaction.
Further informati onon Active Distance AssistDISTRONIC (Ypag e144).
Further informati onon Active BrakeAssist (Ypag e58). 216
Indi
cator andwarni nglampsOn-bo ardcomput erand displays

i
When
driving athigh speeds withtheside
window orroof open:
If you have insert edacarpark ticketinto
retainin gstrip 0087,m akesure thatitis not
blown awaybythe wind. Ashtr
ay X
To open: pushthelower sectionof
cover 0043.
The cover opens.
X To remove theinsert: liftinsert 0087up0044
and out.
X To re-inst allthe insert: pressinsert 0087
into theholder untilitengages. Cigarett
elighter G
WARNIN
G
You canburn yourself ifyou touch thehot
heating element orthe sock etofthe ciga-
rett elighter.
In addition, flammable materialscanignite
if:
R the hot cigarett elighter falls
R ac hild holds thehot cigarett elighter to
object s,for example
There isar isk offire and injury.
Always holdthecigarett elighter bythe
kn ob. Always makesurethatthecigarett e
lighter isout ofreach ofchildren. Never
leave children unsupervised inthe vehicle. Your
attentionmust alway sbefocused onthe
traff iccondit ions.Onlyusethecigarett e
lighter whenroadandtrafficcondit ionsper-
mit.
X Turn theSmart Keytoposition 0048inthe igni-
tion lock (Ypage 118).
X To open: pushthelower sectionof
cover 0043.
The ashtray opens.
X Press incigarett elighter 0044.
Cigarette lighter0044will pop outautomati-
cally when theheating element isred-hot . 12
Vsockets
General notes X
Turn theSmart Keytoposition 0047inthe igni-
tion lock (Ypage 118).
The sock etscan beused foraccessor ieswith
am aximum drawof180 W(15 A). Acc essories
include suchitems aschargers formobile
phones.
If you usethesock etsforlong periods when
the engine isswitched off,thebatter ymaydis-
charge.
i An
emergen cycut- out ensures thattheon-
board voltage doesnotdrop toolow. Ifthe
on- board voltage istoo low, thepower to
the sock etsisautomatically cut.This
ensures thatthere issufficien tpower to
start theengine. 230
Featur
esStowage andfeatures

Engine
compartm ent Hood
Imp ortant safety notes G
WAR
NING
If th eh ood isunlat ched, itmay open up
when thev ehicle isin mot ionand blockyour
view. Thereisar iskofan acc iden t.
Nev erunlat chtheh ood while driving.Before
ever ytrip, ens ure that theh ood isloc ked. G
WAR
NING
When openingand closingthe hood ,itm ay
sudde nlyfall intot he closed posit ion.Ther e
is ar isk ofinjury topers onsw ithinran geof
mov emen tofthe hood .
Open andclosetheh ood onlywhen noone
is with inits ran geofmov emen t. G
WAR
NING
Open ingtheh ood when thee ngine isove r-
heat edorwhen there isaf irei nt he eng ine
com partmen tcoul de xpose you tohot gases
or other servicep roduct s.Ther eisar iskof
inj ury.
Let anove rheatedengine coo ldown before
open ingtheh ood .Ift he re isaf irei nt he
eng inecom partmen t,ke ep theh ood closed
and contactthe fired epar tment . G
WAR
NING
The enginecom partmen tcontain smoving
com ponents.Cert aincom ponents,suc has
th er adiat orfan ,maycon tinue torun orstart
again sudde nlywhen thei gn ition isoff .
Ther eisar iskofinjury.
If you needtod oanywork inside thee ngine
com partmen t:
R swit choff thei gn ition
R nev erreac hintot he area wherethere isa
risk ofdang erfrom mov ingcom ponents,
suc hasthe fan rotatio narea R
rem ove jewelry andwatc hes
R ke ep items ofclo thing and hair, forexam -
ple, away from mov ingpart s
To ens ure thef low offresh airthroug hthe air
ven tsint ot he veh icle interio r,please observe
th ef ollowin gnotes :(Ypage 115)
Open ingtheh ood G
WAR
NING
Cert aincom ponentsint he eng inecom part-
men t,suc hasthe eng ine,radiat orand parts
of thee xhaust system, canbecome very
hot .Workin gint he eng inecom partmen t
pose sariskofinjury.
Wher eposs ible, letthee ngine coo ldown
and touch onlythec om pon entsdesc ribe din
th ef ollowin g. G
WAR
NING
When theh ood isopen andthew indshie ld
wiper sareset inmot ion,you can beinjured
by thew iper linkage. Thereisar iskofinjury.
Always switchoff thew indshie ldwiper sand
th ei gn ition befo reopen ingtheh ood .
! Mak
esure that thew indshie ldwiper sare
no tfold ed away from thew indshie ld.You
coul dotherwise damag ethe wind shieldwip-
ers ortheh ood . X
Mak esure that thew indshie ldwiper sare
tur ned off.
X Pull release lever0043 ontheh ood .
The hood isrele ased. Engine
compartm ent
241Maintenance andcare Z

X
Reac hintot he gap, pullhoodcatch han -
dle 0044upand lifthoo d0043.
If you lifttheh oodb yappr oximat ely15in
(40 cm), theh oodiso pen edand held open
auto maticallyby theg as-filled strut .
Closin gthe hood X
Lowe rthe hoo dand let itfall from aheight
of appr oximat ely8in( 20 cm).
X Chec kthatthe hoo dhasengage dproper ly.
If th eh oodc an be rais edslig htly, itis no t
pro perlyen gage d.Open itagain andcloseit
wit hal ittl em oref orce . Engine
oil
Not eson theo illevel De
pen dingo nyour drivingstyle, thev ehicle
co nsumes upto0.9U Sqt(0.8 lite rs)o fo ilpe r
60 0m iles (1,000 km).Th eo ilco nsumpt ion
may behigh erthan this when thev ehicle is
ne wo rify ou frequen tlydriv eathigh engin e
spee ds.
De pen dingo nthe engin e,theo ildipst ickmay
be inad iffere ntloc atio n.
When check ing theo illeve l:
R park thev ehicle onaleve lsurf ace
R thee ngines hould beswit ched off for
appr oximat elyfivem inute sifthe engin eis
at norm aloper atingtem perat ure
R ifth ee nginei sn otatnorm aloper atingtem -
per atur e,e.g .ift he engin ew asonlystart ed
brie fly,wait about 30min utesbefore carry-
ing out them easurem ent Check
ingtheo illevel usingthe oildip -
st ick G
WAR
NING
Cert aincompo nentsi nt he engin ecom par t-
men t,suc hasthe engin e,radiat orand parts
of thee xhaust system, canbecome very
hot .Workin gint he engin ecom par tment
pose sarisko finjury.
On lytouch thef ollowin gcom ponentsd esc ri-
bed.
If work isbein gcarried outonpublic roads,
pay attentio nt ot he road andtraff icco nd ition s
and secure thea rea asappr opriate . Ex
ample
X Pull outoildipst ick0043.
X Wipe offoildipst ick0043.
X Slo wly slide oildipst ick0043intot he guide
tub etot he stop, and takeito utagain .
If th el eve lisb etween MINmark0087 and
MA Xm ark0044,t heoilleve lisc orrec t.
X Ifth eo illeve lhas dro pped toMIN mark0087
or below, add1.1U Sqt(1l )o fengineo il.
Add ingengine oil G
WAR
NING
Cert aincompo nentsi nt he engin ecom par t-
men t,suc hasthe engin e,radiat orand parts
of thee xhaust system, canbecome very
hot .Workin gint he engin ecom par tment
pose sarisko finjury.
Wher eposs ible, letthee nginec ooldown
and touch onlythec om ponentsd esc ribe din
th ef ollowin g. 242
Engine
compartm entMa intenan ceand care

G
WARNING
If engine oilcomes intocontact withhot
components inthe engine compartment, it
may ignite. Thereisar isk offire and injury .
Make surethatengine oilisnot spilled next
to the filler neck. Letthe engine cooldown
and thoroug hlyclea nthe engine oiloff the
components beforestarting theengine. H
Envi
ronmental note
When addingoil,take care nottospil lany. If
oil enters thesoil orwate rways,itis harmfu l
to the environment.
! Use
only engine oilsa nd oilfilters thatare
app roved forvehicl eswith aservice system.
Al ist ofthe engine oilsa nd oilfilters that
have been tested andapproved inaccord-
ance withMercede s-BenzSpecifications for
Service Productsisava ilable atany author-
ized Mercede s-BenzCenter.
The followi ngcaus eengine failure ordam-
age tothe exhau stsystem:
R Use ofengine oilsa nd oilfilters thathave
not been express lyapp roved forthe ser-
vice system
R Rep lace ment ofengine oiland oilfilter
after thereplacement intervalspecified
by the service system hasexpire d
R Use ofengine oiladd itives
! Do
not add toomuch oil.Ift he oilleve lis
abo vethe "ma x"mark onthe dipstick, too
much oilhas been added. This canleadto
dama getothe engine orthe catal yticcon-
verter. Haveexcess oilsiph oned off. Example
:engine oilcap X
Turn cap0043counter-clockwi seand remove
it.
X Add engine oil.
If the oilleve lisa torb elow the MIN mark
on the oildip stick, add1.1USqt(1.0 liter)
of engine oil.
X Rep lace cap0043onthe filler neck andturn
clockwis e.
Ensure thatthecap locks intoplace
secure ly.
X Che ckthe oilleve laga in with theoildip stick
(Y pag e242) .
Further informati ononengine oil
(Y pag e302) . Che
ckin gand adding otherservice
products
Che ckin gcoolan tlev el G
WARNING
Certa incomponents inthe engine compart-
ment, suchasthe engine, radiator andparts
of the exhau stsystem, canbecome very
hot. Working inthe engine compartment
poses arisk ofinjury .
Where possible,let the engine cooldown
and touch onlythecomponents describedin
the followi ng. G
WARNING
Opening thehood when theengine isover-
heate dorwhen there isaf ire inthe engine
compartment couldexpose youtohot gase s
or other service products.There isar isk of
injury .
Let anoverhe atedengine cooldownbefore
openi ngthe hood. Ifthere isaf ire inthe
engine compartment, keepthehood closed
and contact thefire depa rtment. G
WARNING
The engine compartment containsmoving
components. Certaincomponents, suchas
the radiator fan,may continue torun orstart
aga insud denly whentheignitio niso ff.
There isar isk ofinjury . Eng
inecompar tment
243Mainten anceandcare
Z

If
you need todo any work inside theengine
compartment:
R switch offthe ignition
R never reach intothearea where thereisa
risk ofdanger frommoving components,
such asthe fanrotation area
R remove jewelryandwatches
R keep items ofclothing andhair, forexam-
ple, awayfrom moving parts G
WARNING
The cooling systemispressu rized,particu-
larl yw hen themotor iswarm. Ifyou open
the cap, youcould bescalde difh ot coolant
spray sout. There isar isk ofinjury.
Let the engine cooldown before youopen
the cap. Wear protective glovesandprotec-
tive eyew earwhen opening. Openthecap
slow lyto relea sepressu re. Example
X Park thevehicle onalevel surface.
Only check thecoolant levelwhen thevehi-
cle ison alevel surface andtheengine has
cooled down.
X Turn theSmartKey topositio n0048 inthe igni-
tion lock (Ypage 118).
On vehicle swithKEYLESS- GO,press the
Start/St opbutton twice(Ypage 118).
X Check thecoolant temperature gageinthe
multifu nctiondisplay.
The coolant temperature mustbebelow
158 ‡(70 †).
X Turn theSmartKey topositio n0092
(Y page 118)inthe ignition lock. X
Slowl yturn cap 0043half aturn counter-clock-
wise toallow excess pressureto escape .
X Turn cap0043further <004600520058005100570048005500100046004F00520046004E005A004C0056
0048[ and
remove it.
If the coolant isat the level ofmarker bar
0087 inthe fillerneck when cold,there is
enough coolant incoolant expansion
tank 0044.
If the coolant levelisappro ximately 0.6in
(1.5 cm)above marker bar0087inthe filler
neck when warm, thereisenough coolant in
expansion tank0044.
X Ifnecessary ,add coolant thathasbeen tes-
ted and appro vedbyMercedes-Benz.
X Repl acecap 0043and turn itclockwise asfar
as itwil lgo.
Further information oncoolant (Ypage 303).
Windshie ldwashe rsystem G
WARNING
Certai ncomponents inthe engine compart-
ment, suchasthe engine, radiator andparts
of the exhau stsystem, canbecome very
hot. Working inthe engine compartment
poses arisk ofinjury.
Where possible,let the engine cooldown
and touch onlythecomponents describedin
the follow ing. G
WARNING
If you open thehood when thedrive system
has overhea tedorduri ngafire inthe engine
compartment, youcould come intocontact
with hotgases orother escapi ngopera ting
flui ds. There isar isk ofburns.
Let the overhea tedcomponents cooldown
before opening thehood. Inthe event ofa
fire inthe engine compartment, keepthe
hood closed andcallthefire service. G
WARNING
Windshi eldwash erconcentrate ishighl y
flamma ble.Ifwindshi eldwash erconcentrate
gets onto hotcomponents ofthe engine or
the exhau stsystem, itcan ignite. Thereisa
risk offire and injury. 244
Eng
inecompar tmentMaintenanc eand care

Make
surethatwindshield washerconcen-
trate isnot spilled inthe vicinity ofthe filler
neck . Example
X To open: pullcap 0043upwa rdsbythe tab.
X Add thepremixed washerfluid.
X To close :press cap0043onto thefiller neck
until itengages.
If the washer fluidlevel drops below therec-
ommended minimumfluidlevel of1U Sqt
(1 liter), amessage appears inthe multifunc-
tion display prompting youtoadd washer fluid
(Y page 207).
Further information onwindshield washer
fluid/antifreeze (Ypage 304). Overview
ofthe engine compart -
ment Example
engine
0043 Engin eoilcap
0044 Oildipstick
0087 Brake fluidreservoir
0085 Washer fluidreservoir
0083 Coolant expansion tank ASSYST
PLUS Service
display
The ASSYST PLUS service interval displayindi-
cates theremaining timeperiod orthe remain-
ing distance tothe next regular service due
date.
Inform ationonthe type ofservice andservice
intervals (seetheseparate Maintenanc eBook-
let).
You canobtain further information froman
authorized Mercedes-Ben zCenter orat
http: //www.mbusa.com (USAonly).
i The
ASSYST PLUS service interval display
does notshow anyinformation onthe
engine oillevel. Observe thenotes onthe
engine oillevel (Ypage 242).
The multifunction displayshowsaservice dis-
play forafew seconds, e.g.:
R Service Ain..Days Service
Ain..Days
R Service ADue Service
ADue
R Service AExceeded by..Days Service
AExceeded by..Days
Depending onthe operating conditionsofthe
vehicle, theremaining timeordistance until
the next service duedate isdisplay ed.
The letter A A
or B B,p
ossibly inconn ection witha
number oranother letter,shows thetype of
service. A A
stands foram inor service andB B
for
am ajor service.
You canobtain further information froman
authorized Mercedes-Ben zCenter.
Depending onhow thevehicle isused, the
ASS YST PLUS service interval displaymay
reduce theservice interval, e.g.inthe follow-
ing situations:
X the vehicle isprimarily usedtotravel short
distances
X ifthe engine isoften leftidling forlong peri-
ods
X ifthere arefrequent coldstart phases
Mercedes-Ben zrecommen dsyou avoid such
operating conditions.
The ASSYST PLUS service interval displaydoes
not take intoaccount anyperiods oftime dur-
ing which thebattery isdisconnec ted. ASSY
STPLUS
245Maintenance andcare Z

Maintaining
thetime-dependent servicesched-
ule:
X Note down theservice duedate display edin
the multifunction displaybeforedisconnec t-
ing the battery.
or X Aft erreconn ectingthebattery, subtract the
battery disconnec tionperiods fromtheser-
vice date shown onthe display . Hiding
service displays
X Press the0076 or0038 button onthe steer-
ing wheel. Showing
servicedisplays
X Switch onthe ignition.
X Press 0059or0065 onthe steering wheel
to select theServ. Serv.
menu.
X Press 0063or0064 toselect theASSYST ASSYST
PLUS PLUS
submenu andconfirm bypressing the
0076 button.
The service duedate appears inthe multi-
funct iondisplay . Informat
ionabout Service
Resetting theASSYST PLUSservice
interval display !
If
the ASS YST PLUS service interval dis-
play hasbeen inadvertent lyreset, thisset-
ting canbecorrect edataq ualified special-
ist workshop.
Have service workcarried outasdescribed
in the Maintenanc eBooklet. Thismay other-
wise leadtoincreased wearanddamage to
the major assemblies orthe vehicle.
Aq ualified specialist workshop, e.g.anauthor-
ized Mercedes-Ben zCenter, willreset the
ASS YST PLUS service interval displayafterthe
service workhasbeen carried out.Youcan
also obtain further information onmainte-
nance work,forexample. Special
servicerequirements The
specified maintenanc einterval takesonly
the normal operation ofthe vehicle into
account. Serviceworkwillneed tobe per-
formed moreoften ifthe vehicle isoperated
under arduou scondition sorincreased loads.
The ASSYST PLUS service interval displayis
only anaid. Thedriver ofthe vehicle isrespon-
sible forwhether serviceworkwillneed tobe
performed morefrequently thanrequired asa
result ofthe actual operating conditions
and/or loads.
Examples ofarduou soperating condition s:
R regular citydriving withfrequent intermedi-
ate stops
R the vehicle isprimarily usedtotravel short
distances
R frequent useinmountainous terrainoron
poor roadsurfaces
R the engine isoften leftidling forlong peri-
ods
R particularly dustycondition s,or ifair-recir-
culation modeisfrequently used
In these orsimilar operating conditions,have
the interior filter,airfilter, engine oiland oilfil-
ter, forexample, changedmorefrequently.
Under arduou soperating condition s,the tires
must becheck edmore often. Further informa-
tion canbeobtained ataq ualified specialist
workshop.
Driving abroad An
exten siveMercedes-Ben zService network
is also availa bleinother countr ies.You can
obtain further information fromanyauthorized
Mercedes-Ben zService Center. Care
Notes
oncare H
Environmental
note
Dispose ofempty packaging andcleaning
cloths inan environm entallyresponsible
manner.
! When
cleaning yourcar,donot use:
R dry, coarse orhard cloths
R abrasive cleaningagents 246
CareMaintenance
andcare