coolant level MERCEDES-BENZ SL ROADSTER 2018 Owner's Manual

Exhaust pipe .................................. 268
Exterior lights ................................ 267
Matte finish ................................... 265
Notes ............................................. 263
Paint .............................................. 265
Power washer ................................ 264
Rear view camera .......................... 267
Sensors ......................................... 267
Washing by hand ........................... 264
Wheels ........................................... 266
Windows ........................................ 266
Wiper blades .................................. 267
CD
see also Digital Operator's Man-
ual .................................................. 236
CD player (on-board computer) ........ 191
Center console
Lower section .................................. 36
Lower section (AMG vehicles) .......... 37
Upper section .................................. 35
Central locking
Automatic locking (on-board com-
puter) ............................................. 196
Locking/unlocking (SmartKey) ........ 73
Child
Restraint system .............................. 58
Child seat
Forward-facing restraint system ...... 59
On the front-passenger seat ............ 59
Rearward-facing restraint system .... 59
Children
Special seat belt retractor ............... 57
Children in the vehicle
Important safety notes .................... 56
Cigarette lighter ................................ 247
Cleaning
Mirror turn signal ........................... 267
Climate control
Automatic climate control (dual-
zone) .............................................. 113
Controlling automatically ............... 116
Cooling with air dehumidification .. 115
Defrosting the windows ................. 118
Defrosting the windshield .............. 117
General notes ................................ 113
Indicator lamp ................................ 116
Information about using auto-
matic climate control ..................... 114 Maximum cooling .......................... 118
Overview of systems ...................... 113
Problem with the rear window
defroster ........................................ 118
Problems with cooling with air
dehumidification
............................ 116
R

efrigerant ..................................... 316
Refrigerant filling capacity ............. 317
Setting the air distribution ............. 117
Setting the air vents ...................... 119
Setting the airflow ......................... 117
Setting the climate mode (AIR
FLOW) ............................................ 116
Setting the temperature ................ 116
Switching air-recirculation mode
on/off ............................................ 118
Switching on/off ........................... 115
Switching residual heat on/off ...... 119
Switching the rear window
defroster on/off ............................ 118
Switching the ZONE function
on/off ............................................ 117
Cockpit
Overview .......................................... 32
see Instrument cluster
COMAND
Driving dynamics display (except
Mercedes-AMG vehicles) ....... 163, 165
Driving dynamics display
(Mercedes-AMG vehicles) .............. 167
Combination switch .......................... 107
Compass
Calibrating ..................................... 256
Calling up ....................................... 255
Setting ........................................... 256
Connecting a USB device
see also Digital Operator's Man-
ual .................................................. 236
Consumption statistics (on-board
computer) .......................................... 188
Controller ........................................... 237
Convenience closing feature .............. 87
Coolant (engine)
Checking the level ......................... 260
Display message ............................ 213
Filling capacity ............................... 316
Important safety notes .................. 315
Index7

Turn signalsDisplay message ............................ 212
Switching on/off ........................... 107
Two-way radio
Frequencies ................................... 310
Installation ..................................... 310
Transmission output (maximum) .... 310
Type identification plate
see Vehicle identification plate
U
Umbrella holder ................................. 243
Unlocking
Emergency unlocking ....................... 80
From inside the vehicle (central
unlocking button) ............................. 79
Upshift indicator (on-board com-
puter, Mercedes-AMG vehicles) ....... 197
USB devices
Connecting to the Media Inter-
face ...............................................2 41
V
Vehicle
Correct use ...................................... 28
Data acquisition ............................... 29
Display message ............................ 222
Electronics ..................................... 310
Equipment ....................................... 25
Individual settings .......................... 194
Limited Warranty .............................2 9
Loading .......................................... 295
Locking (in an emergency) ............... 80
Locking (SmartKey) .......................... 73
Lowering ........................................ 308
Maintenance .................................... 26
Parking for a long period ................ 144
Pulling away ................................... 124
Raising ........................................... 305
Reporting problems ......................... 28
Securing from rolling away ............ 305
Tow-starting ................................... 280
Towing away .................................. 280
Transporting .................................. 282
Unlocking (in an emergency) ........... 80
Unlocking (SmartKey) ...................... 73
Vehicle data ................................... 317 Vehicle battery
see Battery (vehicle)
Vehicle data ....................................... 317
Vehicle dimensions ........................... 317
Vehicle emergency locking ................ 80
Vehicle identification number
see VIN
Vehicle identification plate .............. 311
Vehicle level
Active Body Control (ABC) (except
Mercedes-AMG vehicles) ............... 163
Active Body Control (ABC)
(Mercedes-AMG vehicles) .............. 165
Display message ............................ 215
Vehicle tool kit .................................. 270
Video
Operating the DVD ......................... 191
see also Digital Operator's Man-
ual .................................................. 236
VIN
Seat ............................................... 312
Type plate ...................................... 311W
Warning and indicator lampsABS ................................................ 229
Active Brake Assist ........................ 234
Brake Assist ................................... 234
Brakes ........................................... 228
Check Engine ................................. 232
Coolant .......................................... 232
Distance Pilot DISTRONIC ............. 234
Distance warning ........................... 234
ESP
®.............................................. 229
ESP®OFF ....................................... 230
Fuel tank ........................................ 232
General notes ................................ 227
Parking brake ................................ 231
PASSENGER AIR BAG ...................... 41
Reserve fuel ................................... 232
Restraint system ............................ 231
Seat belt ........................................ 227
SPORT handling mode ................... 231
Tire pressure monitor .................... 235
Warning triangle ................................ 269
Warranty .............................................. 25
Index21

ProblemPossible causes/consequences andMSolutions
The coolant temperature
gauge shows a value
above 248 ‡ (120 †).
The coolant warning
lamp may also be on and
a warning tone may
sound.The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently.
XStop as soon as possible and allow the engine and the coolant to
cool down.
XCheck the coolant level (Ypage 260). Observe the warning notes
as you do so and add coolant if necessary.
If the coolant level is correct, the engine radiator fan may be faulty. The
coolant is too hot and the engine is no longer being cooled sufficiently.
XAt coolant temperatures below 248 ‡(120 †), drive to the nearest
qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-and-go traffic.
DYNAMIC SELECT button (all vehicles
except Mercedes-AMG vehicles)
Use the DYNAMIC SELECT button to change the
drive program. Depending on the drive program
selected the following vehicle characteristics
will change:
Rthe drive (engine and transmission manage-
ment)
Rthe suspension
Rthe steering
Rthe curve tilting function (vehicles with Active
Body Control)
Rthe control thresholds of ESP®
Each time you start the engine with the Smart-
Key or the Start/Stop button, drive program Cis
activated. For further information about starting
the engine, see (
Ypage 123).
XPress DYNAMIC SELECT button :as many
times as necessary until the desired drive
program is selected.
The selected drive program appears in the
multifunction display. After a short period of
time, the display goes out and the symbol for the selected drive program appears.
In addition, the current drive program settings
are displayed briefly in the multimedia systemdisplay.
iIn a few countries, the ECO start/stop func-
tion is deactivated at the factory due to the
available fuel grade. In this case, the ECO
start/stop function is not available in any
drive program, regardless of the display in the
multimedia system display.
Available drive programs:
C ComfortComfortable and economi-
cal driving characteristics
SSportSporty driving characteris-
tics
S+ Sport PlusParticularly sporty driving
characteristics
IIndividualIndividual settings
128DYNAMIC SELECT button (all vehicles except Mercedes-AMG vehicles)
Driving and parking

Coolant temperature gauge
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
!A display message is shown if the coolant
temperature is too high.
If the coolant temperature is over 248 ‡
(120 †), do not continue driving. The engine
will otherwise be damaged.
The coolant temperature gage is in the instru-
ment cluster on the right-hand side (
Ypage 33).
The Hmarking in the coolant temperature gauge
corresponds to a coolant temperature of
approximately 248 ‡ (120 †).
Under normal operating conditions and at the
correct coolant level, the coolant temperature
gauge may rise to the Hmarking.
Operating the on-board computer
Overview
:Multifunction display
;Right control panel
=Left control panel
XTo activate the on-board computer: turn
the SmartKey to position 1in the ignition
lock.
You can control the multifunction display and
the settings in the on-board computer using the
buttons on the multifunction steering wheel.
Left control panel
=
;RCalls up the menu and menu bar
9
:Press briefly:
RScrolls in lists
RSelects a submenu or function
RIn the Audiomenu: selects the
previous or next station, when the
preset list or station list is active,
or an audio track or video scene
RIn the Tel(telephone) menu:
switches to the phone book and
selects a name or telephone num-
ber
186Displays and operation
On-board computer and displays

Engine
Display messagesPossible causes/consequences andMSolutions
?
CheckCoolantLevelSee Operator's Man‐ual
The coolant level is too low.
!Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
XAdd coolant, observing the warning notes before doing so
(Ypage 260).
XIf you need to add coolant more often than usual, have the engine
coolant system checked at a qualified specialist workshop.
?The fan motor is malfunctioning.
XIf the coolant temperature gauge is below the Hmarking
(Ypage 186), drive on to the next qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-and-go traffic.
?
Coolant Too HotStop Vehicle TurnEngine Off
The coolant is too hot.
A warning tone also sounds.
GWARNING
Do not drive when your engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to catch
fire.
Steam from the overheated engine can also cause serious burns which
can occur just by opening the hood.
There is a risk of injury.
XPull over and stop the vehicle safely and switch off the engine, pay- ing attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XLeave the vehicle and keep a safe distance from the vehicle until the
engine has cooled down.
XMake sure that the air supply to the engine radiator is not blocked,
e.g. by snow, slush or ice.
XDo not start the engine again until the display message goes out and
the coolant temperature gauge is below the Hmarking
(
Ypage 186). Otherwise, the engine could be damaged.
XPay attention to the coolant temperature gauge, observing the
warning notes (Ypage 260).
XIf the temperature increases again, visit a qualified specialist work-
shop immediately.
Under normal operating conditions and at the correct coolant level,
the coolant temperature gauge may rise to the Hmarking
(
Ypage 186).
Display messages213
On-board computer and displays
Z

Engine
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
;NThe yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, for example:
Rin the engine management
Rin the fuel injection system
Rin the exhaust system
Rin the ignition system
Rin the fuel system
The emission limit values may be exceeded and the engine may be in emergency
mode.
XVisit a qualified specialist workshop immediately.
In some states, you must immediately visit a qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up. This is due to the legal require-
ments in effect in these states. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving.
8N The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
XRefuel at the nearest gas station.
8N The yellow reserve fuel warning lamp flashes while the vehicle is in motion.
In addition, the ;Check Engine warning lamp may light up.
The fuel filler cap is not closed correctly or the fuel system is leaking.
XCheck that the fuel filler cap is correctly closed.
XIf the fuel filler cap is not correctly closed: close the fuel filler cap.
XIf the fuel filler cap is closed:visit a qualified specialist workshop.
?NThe red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 142).
XConsult a qualified specialist workshop.
232Warning and indicator lamps
On-board computer and displays

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
?NThe red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be defective.
The coolant is too hot and the engine is no longer being cooled sufficiently.
XObserve the additional display messages in the multifunction display.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XLeave the vehicle and keep a safe distance from the vehicle until the engine has cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 260).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
XDo not start the engine again until the coolant temperature gauge is below the H
marking (Ypage 186). Otherwise, the engine could be damaged.
XDrive to the nearest qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-and-go traffic.
?N The red coolant warning lamp comes on while the engine is running.
The coolant temperature gauge has exceeded the Hmarking (
Ypage 186). The
airflow to the engine radiator may be blocked or the coolant level may be too low.
GWARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can occur
just by opening the hood.
There is a risk of injury.
XObserve the additional display messages in the multifunction display.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 142).
XLeave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 260).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
Warning and indicator lamps233
On-board computer and displays
Z

GWARNING
If engine oil comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next to
the filler neck. Let the engine cool down and
thoroughly clean the engine oil off the com-
ponents before starting the engine.
HEnvironmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful to
the environment.
!Use only engine oils and oil filters that are
approved for vehicles with a service system. A list of the engine oils and oil filters that have
been tested and approved in accordance with
Mercedes-Benz Specifications for Service
Products is available at any authorized
Mercedes-Benz Center.
The following cause engine failure or damage
to the exhaust system:
RUse of engine oils and oil filters that have
not been expressly approved for the service
system
RReplacement of engine oil and oil filter after
the replacement interval specified by the
service system has expired
RUse of engine oil additives
!Do not add too much oil. If the oil level is
above the "max" mark on the dipstick, too
much oil has been added. This can lead to
damage to the engine or the catalytic con-
verter. Have excess oil siphoned off.
Example: engine oil cap
XTurn cap :counter-clockwise and remove it.
XAdd engine oil.
If the oil level is at or below the MIN mark on
the oil dipstick, add 1.1 US qt (1.0 liter) of
engine oil.
XReplace cap :on the filler neck and turn
clockwise.
Ensure that the cap locks into place securely.
XCheck the oil level again with the oil dipstick
(Ypage 259).
Further information on engine oil (
Ypage 314).
Checking and adding other service
products
Checking coolant level
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and touch only the components described in the
following.
GWARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
Example
260Engine compartment
Maintenance and care

XPark the vehicle on a level surface.
Only check the coolant level when the vehicleis on a level surface and the engine has cooled
down.
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 122).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (
Ypage 122).
XCheck the coolant temperature gage in the
multifunction display.
The coolant temperature must be below
158 ‡ (70 †).
XTurn the SmartKey to position u
(Ypage 122) in the ignition lock.
XSlowly turn cap ;half a turn counter-clock-
wise to allow excess pressure to escape.
XTurn cap ;further counter-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the filler neck when cold, there is enough
coolant in coolant expansion tank :.
If the coolant level is approximately 0.6 in
(1.5 cm) above marker bar =in the fuel filler
neck when warm, there is enough coolant in
expansion tank :.
XIf necessary, add coolant that has been tested
and approved by Mercedes-Benz.
XReplace cap;and turn it clockwise as far as
it will go.
Further information on coolant (
Ypage 315).
Windshield washer system
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and touch only the components described in the
following.
GWARNING
Windshield washer concentrate could ignite if it comes into contact with hot engine compo-
nents or the exhaust system. There is a risk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
Example
XTo open: pull cap:upwards by the tab.
XAdd the premixed washer fluid.
XTo close: press cap :onto the filler neck
until it engages.
If the washer fluid level drops below the recom-
mended minimum fluid level of 1 US qt (1 liter),
a message appears in the multifunction display
prompting you to add washer fluid (
Ypage 225).
Further information on windshield washer fluid/
antifreeze (
Ypage 316).
Overview of the engine compartment
Example engine
:
Oil dipstick
;Brake fluid reservoir
=Engine oil cap
?Coolant expansion tank
AWasher fluid reservoir
Overview of the engine compartment261
Maintenance and care
Z

Curb weight
The weight of a vehicle with standard equipment
including the maximum capacity of fuel, oil and
coolant. It also includes the air-conditioning sys-
tem and optional equipment if these are instal-
led in the vehicle, but does not include passen-
gers or luggage.
Maximum load rating
The maximum load rating is the maximum per-
missible weight in kilograms or lbs for which a
tire is approved.
Maximum permissible tire pressure
Maximum permissible tire pressure for one tire.
Maximum load on one tire
Maximum load on one tire. This is calculated by
dividing the maximum axle load of one axle by
two.
PSI (pounds per square inch)
A standard unit of measure for tire pressure.
Aspect ratio
Relationship between tire height and tire width
in percent.
Tire pressure
This is pressure inside the tire applying an out-
ward force to each square inch of the tire's sur-
face. The tire pressure is specified in pounds per
square inch (psi), in kilopascal (kPa) or in bar.
The tire pressure should only be corrected when
the tires are cold.
Cold tire pressure
The tires are cold:
Rif the vehicle has been parked with the tires
out of direct sunlight for at least three hours
and
Rif the vehicle has not been driven further than
1 mile (1.6 km)
Tread
The part of the tire that comes into contact with
the road.
Bead
The tire bead ensures that the tire sits securely
on the wheel. There are several steel wires in the
bead to prevent the tire from coming loose from the wheel rim.
Sidewall
The part of the tire between the tread and the
bead.
Weight of optional extras
The combined weight of those optional extras
that weigh more than the replaced standard
parts and more than 2.3 kg (5 lbs).Thes e
option al extras, such as high-performance
brakes, level control, a roof rack or a high-per-
formance battery, are not included in the curb
weight and the weight of the accessories.
TIN (Tire Identification Number)
This is a unique identifier which can be used by
a tire manufacturer to identify tires, for example
for a product recall, and thus identify the pur-
chasers. The TIN is made up of the manufactur-
er's identity code, tire size, tire type code and
the manufacturing date.
Load bearing index
The load bearing index (also load index) is a code
that contains the maximum load bearing capa-
city of a tire.
Traction
Traction is the result of friction between the tires
and the road surface.
Treadwear indicators
Narrow bars (tread wear bars) that are distrib-
uted over the tire tread. If the tire tread is level
with the bars, the wear limit of áin (1.6 mm)
has been reached.
Occupant distribution
The distribution of occupants in a vehicle at their
designated seating positions.
Total load limit
Nominal load and luggage load plus 68 kg
(150 lbs) multiplied by the number of seats in
the vehicle.
Changing a wheel
Flat tire
The "Breakdown assistance" section
(Ypage 271) contains information and notes on
how to deal with a flat tire. Information on driv-
ing with MOExtended tires in the event of a flat
Changing a wheel303
Wheels and tires
Z