oil MERCEDES-BENZ C-CLASS CABRIOLET 2021 Owner's Manual

Model
Capacity
C 200 4MATIC
C 300 4MATIC 6.0 litres
C 220 d
C 220 d 4MATIC 6.3 litres
C 300 d6 .8 litres
C 400 4MATIC 6.5 litres
All other models 6.6 litresNote
s on brake fluid Obser
vethe no tes on operating fluids
(/ page 416). &
WARNING Risk of an accident due to
va pour poc kets form ing in the brake sys‐
tem
The brake fluid cons tantly absorbs moi sture
from the air. This lo wersthe boiling point of
th e brake fluid. If the boiling point is too lo w, va
pour poc kets may form inthe brake sys‐
te m when the brakes are applied hard.
This impairs the braking ef fect. #
Have the brake fluid rene we d at the
specified inter vals. Ha
ve the brake fluid regularly replaced at a
qu alified specialist workshop.
Only use a brake fluid appr ovedby Mercedes-
Benz according toMB-F reigabe or MB-Appr oval
33 1.0. Coolant
Note
s on coolant
Obser vethe no tes on operating fluids
(/ page 416). &
WARNING Risk offire ‑ and inju ryfrom
antifreeze
If antifreeze comes into contact with hot
component parts in the engine compart‐
ment, it may ignite. #
Allow the engine tocool down before
yo uto p up the antif reeze. #
Make sure that no antifreeze spills out
next tothefiller opening. #
Thoroughly clean the antif reeze from
component parts before starting the
ve hicle. *
NO
TEDama gecaused byincor rect cool‐
ant #
Only use coolant that has been pre‐
mixed with therequ ired antifreeze pro‐
te ction.
Information on coolant is available at thefo l‐
lowing locations:
R inthe Mercedes-Benz Specification for
Operating Fluids 310.1
- at https://be vo.mercedes-benz.com
- inthe Mercedes-Benz BeVo app
R at a qualified specialist workshop 424
Tech nical da ta

Engine oil
Display messages
Possible causes/consequences and M
MSolutions
5 Check engine oil level
when next refuelling *T
he engine oil le vel has dropped tothe minimum le vel.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
Check the engine oil le vel when next refuelling.
To p up the engine oil (/ page 359).
No tes on engine oil (/ page 422).
5
Add 1 litre engine oil when
next refuelling *D
isplay message only for cer tain engines:
The engine oil le vel has dropped tothe minimum le vel.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
When next refuelling, add 1 litre of engine oil (/ page 359).
No tes on engine oil (/ page 422). Display messages and
warning/indicator lamps 483

Display messages
Possible causes/consequences and M
MSolutions
5 Engine oil level Reduce oil
level *D
isplay message only for cer tain engines:
The engine oil le vel is too high.
* NO
TEEngine dama gecaused bydriving with excess engine oil #
Avoid long journe yswith excess engine oil. #
Consult a qualified specialist workshop immediately and ha vethe engine oil le velre duced.
5 Engine oil level Stop vehi-
cle Switch engine off *D
isplay message only for cer tain engines:
The engine oil le vel is too lo w.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Add 1 l of engine oil (/ page 359). #
Check the engine oil le vel.
No tes on engine oil (/ page 422).484
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
5 Engine oil pressure Stop
Switch off engine *D
isplay message only for cer tain engines:
The oil pressure is too lo w.
* NO
TEEngine dama gecaused bydriving with insuf ficient oil pressure #
Avoid driving with insuf ficient oil pressure. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop.
5 Engine oil level cannot be
measured *T
he electrical connection tothe oil le vel sensor has been inter rupte d or the oil le vel sensor is faulty. #
Consult a qualified specialist workshop. Wa
rning and indicator lamps Overview of indicator and
warning lamps Some sy
stems will per form a self-test when the
ignition is switched on. Some indicator and wa
rning lamps may briefly light up or flash. This
behaviour is non-critical. These indicator and
wa rning lamps indicate a malfunction only if they
light up or flash af terth e engine has been star‐
te d or during a journe y. Displ
aymessa ges and warning/indicator lamps 485

Sy
stem limits.........................................1 98
Tr ailer operation.................................... 19 8
Ac tive Parking Assist
Exiting a parking space......................... .216
Fu nction................................................. 213
Pa rking................................................. .215
Sy stem limitations................................. 213
Ac tive Se rvice Sy stem PLUS
see AS SYST PLUS
Ac tive Speed Limit Assi st
Displ ay.................................................. 183
Fu nction................................................ 183
Ac tive Steering Assist
Ac tivating/deactivating......................... 187
Ac tive Emergency Stop Assis t............... 188
Fu nction................................................ 186
Sy stem limits.........................................1 86
Ad aptive brake lights ................................ 174
Ad aptive cruise control
see Active Dis tance Assi stDISTRONIC
Ad aptive Highbeam Assist Plus
Fu nction................................................. 124
Switching on/of f................................... 12 5Ad
Blue ®
Ad ditives................................................ 421
Capacity................................................ 422
No tes..................................................... 15 8
Purity..................................................... 421
To pping up............................................. 15 9
Ad ditional door lo ck.................................... 75
Ad diti ves
Ad Blue ®
................................................. 421
Engine oil.............................................. 422
Fu el........................................................4 19
Ad diti ves (AdBlue ®
)
see AdBlue ®
Ad diti ves (engine oil)
see Additives
Ad diti ves (fuel)
see Fuel
Ad dress book
see Contacts
Ad justing bass, mid- range and treble
settings
Adva nced sound sy stem........................3 53Ad
justing mid- range, treble and bass
settings
Adva nced sound sy stem........................3 53
Ad justing the balance/ fader
Adva nced sound sy stem........................3 53
Burmes ter®
sur round sound sy stem..... 353
Ad justing the bass, mid- range and
treble
Burmes ter®
sur round sound sy stem..... 352
Ad justing the mid- range, treble and
bass
Burmes ter®
sur round sound sy stem..... 352
Ad justing the sound focus
Burmes ter®
sur round sound sy stem..... 353
Ad justing treble, mid- range and bass
settings
Adva nced sound sy stem........................3 53
Burmes ter®
sur round sound sy stem..... 352
ADS PLUS damping sy stem
see AIRMATIC
Ad vanced sound sy stem
Ad justing the balance/fader................. 353 Index
501

Car
key
see Key
Car wash
see Care
Car wash (care)......................................... 362
Care 360° camera......................................... 368
Air-water duct........................................3 62
Au tomatic car wash............................... 362
Carpe t.................................................. .369
Decorative foil...................................... .365
Displ ay.................................................. 369
Draught stop......................................... 367
Exterior lighting..................................... 368
Fo lding draught stop.............................3 68
High-p ressure cleaner........................... 364
Matt finis h............................................. 364
Pa int wo rk.............................................. 364
Plastic trim............................................ 369
Re alwo od/trim elements..................... 369
Re versing camera................................. .368
Ro of lining.............................................3 69
Seat belt............................................... .369
Seat co ver............................................. 369
Senso rs................................................. 368 Soft
top................................................. 366
St eering wheel...................................... 369
Ta ilpipes................................................ 368
Tr ailer hit ch........................................... 368
Wa shing byhand................................... 364
Wheels/rims.........................................3 68
Wi nd de flector.......................................3 66
Wi ndo ws................................................ 368
Wi per blades.........................................3 68
Carpet (Care)............................................. 369
Changing gears
Manually. ............................................... 15 3
Changing hub caps .................................. .405
Charging Battery (vehicle).................................... 384
Chassis Damping characteristics....................... .201
DY NA MIC BODY CONTROL.................... 201
Child seat Appr oval categories................................ .58
At tach ing (no tes).....................................58
Basic instructions.................................... 53
Fr ont passenger seat (no tes)...................69 Fr
ont passenger seat (without auto‐
matic airbag shutoff)...............................68
ISOFIX/i-Size (fitting).............................. 62
No tes on risks and dangers..................... 54
Re commended child restra int sy stems.... 57
Seats suitable for belt-secu redch ild
re stra int sy stems..................................... 65
Seats suitable for i‑Size child
re stra int sy stems..................................... 62
Seats suitable for ISOFIX child
re stra int sy stems..................................... 60
Securing on the co-driver seat................70
Secu ring on there ar seat........................ 67
To pTe ther............................................... 64
Child ren
Av oiding dangers in theve hicle............... 54
Basic instructions.................................... 53
Cho ck
St orage location.................................... 404
Chock see Chock
CI+ module Calling up a menu..................................3 51
Inserting the smart card........................ 350 506
Index

Cruise control
Activating.............................................. 17 7
Buttons.................................................. 17 7
Calling up a spee d................................. 17 7
Deactivating.......................................... 17 7
Fu nction................................................. 176
Re quirements........................................ 17 7
Selecting............................................... 17 7
Setting a speed...................................... 17 7
St oring a speed.....................................1 77
Sy stem limitations................................. 176D
Dashboa rd
see Cockpit
Data acquisition Vehicle.................................................... 33
Data import/export Function/no tes..................................... 262
Importing/exporting............................. 263
Data pr otection rights
Data storage............................................ 36
Data storage
Data pr otection rights............................. 36 Electro
nic control units.......................... .33
Online services........................................35
Ve hicle.................................................... 33
Date Setting the time and date automati‐
cally....................................................... 257
Deactivating the alarm (A TA )...................... 93
Deale rship
see Qualified speciali stwo rkshop
Declaration of conformity Electromagnetic compatibility.................25
Jack......................................................... 28
Specific absor ption rate.......................... 25
TIREFIT kit............................................... 29
Wi reless vehicle components.................. 25
Decorative foil (cleaning instructions) .... 365
DeNOx agent see AdBlue ®
De stination
Editing intermediate destinations......... .274
Editing the pr evious destinations.......... 285
Ex tern al................................................. 285
Saving (cur rent vehicle position)........... 285 Saving as a
favo urit e............................. 285
Saving asglobal favo urit e...................... 285
St oring a map position..........................2 85
Dest ination entry
En tering a 3 wordaddress..................... 275
Entering a POI or address...................... 270
Entering an intermedia tedestination.....2 74
Entering geo-coordinates....................... 275
Selecting a contact................................ 275
Selecting a POI...................................... 273
Selecting from the map......................... 276
Selecting pr evious destinations............ .273
De tecting inat tentiveness
see ATTENTION ASSIST
Diagnostics connection .............................. 29
Diesel Low outside temp eratures..................... 419
No tes..................................................... 419
Digital Owner's Manual .............................. 20
Digital TV
see TV
Dinghy towing
see Tow- bar sy stem 508
Index

DIRECT SELECT le
ver
Engaging drive position........................ .152
Engaging neutral................................... .151
Engaging pa rkposition.......................... 15 2
Engaging pa rkposition automatically....1 52
Engaging reve rsege ar........................... .151
Fu nction................................................ 15 0
Display (care) ............................................ .369
Display (multimedia sy stem)
Settings................................................. 256
Display (on-boa rdcompu ter)
Displ ays on the multifunction displa y.... 229
Displ aymessage
Calling up (on-board compu ter)............ .430
No tes....................................................4 30
Display messages ¯ - - - km/h ..................................... 457
ç - - - km/h ..................................... 458
È - - - km/h ..................................... 457
# 12V battery See Owner's Man‐
ual......................................................... 472K
12V battery See Owner's Man‐
ual......................................................... 437
Û 48 V battery See Owner's Man‐
ual..........................................................4 74
: Active Light Sy stem inoperative... 439
¯ AdBlue sy stem fault Emer. op.:
max. XXX mphSt art not poss. in XXX
miles .................................................... .482
¯ AdBlue sy stem fault Emer‐
ge ncy op. in XXX km See Owner's
Manual.................................................. 481
¯ AdBlue sy stem fault Engine
st art not possible................................. .482
¯ AdBlue sy stem fault See Own‐
er's Manual ............................................ 481
5 Add 1 litre engine oil when
next refuelling....................................... 483
é ATTENTION ASSIST inoperative ....456
é ATTENTION ASSIS T:Take a
break!....................................................4 56:
Automatic driving lights inoper‐
ative...................................................... 438
Á Change key bat teries ...................4 34
J Checkbrake fluid le vel................. 455
5 Check engine oil le vel when
next refuelling....................................... 483
ï Checktrailer hitch lo ck................ 441
h Check tyre(s) ................................ 476
! Clean the fuel filter ...................... 448
J Close boot separator .................... 437
K Convertible Top Operation pos‐
sible to60 km/h................................... 436
ÿ Coolant Stop vehicle Switch
engine off..............................................4 46
! currently una vailable See Own‐
er's Manual ............................................ 467
÷ currently una vailable See Own‐
er's Manual .......................................... .468
5 Engine oil le vel cannot be
measured .............................................. 485 Index
509

5
Engine oil le velRe duce oil le vel.... 484
5 Engine oil le velSt op vehicle
Switch engine off.................................. 484
5 Engine oil pressure Stop
Switch off engine.................................. 485
ä Fault Drive at max. 80 km/h........ 464
6 Front left malfunction Consult
wo rkshop (e xample).............................. 431
_ Front left seat backrest not
loc ked (e xamp le).................................. .445
! inoperative See Owner's Man‐
ual......................................................... 468
÷ inoperative See Owner's Man‐
ual......................................................... 469
T inoperative See Owner's Man‐
ual......................................................... 470
G Inoperative................................... 472
: Intellige nt Light Sy stem inoper‐
ative...................................................... 439 Á
Key not de tected (red displ ay
messa ge)............................................... 435
Á Key not de tected (white displ ay
messa ge)............................................... 434
: Left dipped beam (e xamp le)........ .438
6 Left wind owbag malfunction
Consult workshop (e xample)................ .431
¢ Lowe ring...................................... 465
: Malfunction See Owner's Man‐
ual......................................................... 438
ð Maximum speed exceeded ........... 459
Ø ..................................................... 480
ç Off................................................4 58
ë Off................................................ 456
K Open/close top comple tely.......... 437
! Parking brake See Owner's
Manual .................................................. .451
É Please reduce speed .................... 466
Ý Please wait 48 V battery charg‐
ing ........................................................ .474 _
Rear left seat backrest not
loc ked (Example)................................... 445
h Rectify tyre pressure.................... 477
Ø Refill Ad Blue See Owne r’s
Manual.................................................. 480
! Release parking brake .................. 454
¸ Replace air cleaner ......................448
Á Replace key.................................. 434
8 Reser vefuel le vel......................... 448
6 Restra int sys. malfunction Con‐
sult workshop........................................ 431
# See Owner's Manual....................4 73
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual ......443
Ù Steering malfunction Stop
immediately See Owner's Manual .........443
# Stop vehicle Lea veengine run‐
ning ........................................................ 474
# Stop vehicle See Owner's Man‐
ual......................................................... 47351 0
Index

Emer
gency braking
see BAS (Brake Assi stSystem)
Emer gency engine start ............................ 391
Emer gency key
Inserting/removing.................................74
Locking/unlocking the doors.................. 79
Emer gency operation mode
St arting theve hicle...............................1 39
Emer gency spare wheel
No tes..................................................... 41 0
ENERGIZING COMFORT Overview of programmes...................... 268
St arting the programme........................ 268
Engine ECO start/ stop function........................ 14 5
Engine number....................................... 414
St arting (eme rgency operation mode).. .139
St arting (Remo teOnline).......................1 40
St arting (s tart/s top button).................. 13 8
St arting assis tance................................ 384
Switching off (s tart/s top button)...........1 61
Engine bonnet Function (active bonnet)........................ 355 Opening/closing................................... 356
Engine data Displaying.............................................. 15 0
Engine electronics Notes..................................................... 412
Engine number .......................................... .414
Engine oil Additives...............................................4 22
Capacity................................................ 423
Che cking the oil le vel using the oil
dipstick................................................. 358
Checking the oil le vel using the on-
board computer..................................... 359
MB-Fr eigabe or MB-Appr oval................ .423
Quality................................................... 423
To pping up............................................. 359
Entering characters
Fu nction/no tes..................................... 254
On theto uchpad.................................. .256
Using the controller............................... 255
EQ Boost technology
Operating saf ety...................................... 23 ERA-G
LONA SS test mode
St arting/ending.................................... .321
Er ro r message
see Displ aymessa ge
ESC (Electronic Stability Control)
see ESP ®
(Electronic Stability Prog ram)
ESP ®
Crosswind Assis t.................................. .171
Tr ailer stabilisation................................ 172
ESP ®
(Electronic Stability Prog ram)
Ac tivating/deactivating......................... 172
Fu nction/no tes..................................... 17 0
EU general operating permit number ......414
Exterior lighting Care...................................................... 368
Exterior lighting see Lights F
Fa tigue de tection
see ATTENTION ASSIST
Favo urites
Ad ding................................................... 252 Index
515