2017 MERCEDES-BENZ S-Class CABRIOLET engine

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.
General notes
Depending on your driving style, the vehicle
consumes up to 0.9 US qt (0.8 l) of oil per
600 miles (1000 km). The oil consumption may
be higher than this when the vehicle is new or if
you frequently drive at high engine speeds.
Depending on the engine, the oil dipstick may be
in a different location.
When checking the oil level:
Rpark the vehicle on a level surface
Rthe engine should be switched off for approx-
imately five minutes if the engine is at normal
operating temperature
Rif the engine is not at normal operating tem-
perature, e.g. if the engine was only started
briefly, wait about 30 minutes before carrying
out the measurement
Checking the oil level using the oil dip-
stick (except Mercedes-AMG S 65)
Example: checking the oil level using the oil
dipstick
XPull oil dipstick:out of the dipstick guide
tube.
XWipe off oil dipstick :.
XSlowly slide oil dipstick :into the guide tube
to the stop, and take it out again.
If the level is between MIN mark =and MAX
mark ;, the oil level is correct.
XIf the oil level has dropped to MIN mark =or
below, add 1.1 US qt (1.0 l)of engine oil.
Checking the oil level using the on-
board computer (Mercedes-AMG S 65)
Calling up the oil level check
XTurn the SmartKey to position 2in the ignition
lock (Ypage 124).
or
XOn vehicles with KEYLESS-GO, press the
Start/Stop button twice (Ypage 124).
XUse ò on the steering wheel to call up the
list of menus.
XPress the :or9 button on the steering
wheel to select the Servicemenu.
XConfirm by pressing aon the steering
wheel.
XUse : or9 to select the EngineOilLevelsubmenu.
XPressato confirm the selection.
The Measuring Engine Oil Level Accu‐
rate Only When Vehicle Is Levelmes-
sage appears in the multifunction display.
The measurement takes a few seconds. A mes-
sage appears in the multifunction display. The
messages are described in the following chap-
ter.
Oil level display messages in the multifunction display
Display messagesPossible causes/consequences and MSolutions
Engine Oil Level OKThe oil level is correct.
Check Engine OilLevel (Add 1 Liter)
The oil level is too low.
XAdd 1.1 US qt (1.0 liter) of engine oil.
274Engine compartment
Maintenance and care

Display messagesPossible causes/consequences andMSolutions
Reduce Engine OilLevel
The engineoil level is to ohigh .
XHaveexcess engin eoil siphoned off .
For Engine OilLevelIgnitionMustBe On
The ignition is switched off .
XTurn theSmartKey to position 2in th eignition loc k (Ypage 124).
or
XOn vehicles wit hKEYLESS-GO ,press th eStart/Sto pbutto ntwice
(Ypage 124).
Nee dMor eTim etoCheck Engine OilLevel
The require dwaiting period was no tobserved.
XIf th eengin eis at normal operating temperature: repeat th emeas -
uremen tafter about fiv eminutes.
If th eengin eis no tat normal operating temperature, e.g. if th e
engin ewas only started briefly: repeat th emeasuremen tafter
approximately 30 minutes.
Engine Oil LevelNotMeasurabl ewithEngine Runnin g
The engineis running; oil level measuremen tis no tpossible.
XSwitc hoff th eengine.
XIf th eengin eis at normal operating temperature: wait about fiv e
minute sbefore carryin gout th emeasurement.
If th eengin eis no tat normal operating temperature, e.g. if th e
engin ewas only started briefly: wait approximately 30 minute s
before carryin gout th emeasurement.
Adding engine oil
HEnvironmenta lnot e
Whe naddin goil, tak ecar eno tto spil lany. If
oil enters th esoil or waterways, it is harmful to
th eenvironment.
!Use only engin eoils and oil filters that are
approve dfor vehicles wit h aservic esystem. A
list of th eengin eoils and oil filters that hav e
been tested and approve din accordanc ewit h
Mercedes-Ben zSpecification sfor Service
Products is available at any authorize d
Mercedes-Ben zCenter.
The followin gcaus eengin efailure or damag e
to th eexhaust system:
RUse of engin eoils and oil filters that hav e
no tbeen expressl yapprove dfor th eservic e
system
RReplacement of engin eoil and oil filter after
th ereplacemen tinterval specified by th e
servic esystem has expired
RUse of engin eoil additive s
!Do notadd to omuc hoil. addin gto omuc h
engin eoil can result in damag eto th eengin e
or to th ecatalytic converter. Hav eexcess
engin eoil siphoned off .
Example: addingengin eoil
XTurn cap :counter-clockwise and remove it .
XAddengin eoil.
If th eoil level is at or belo wtheMIN mar kon
th eoil dipstick ,add 1. 1US qt (1.0 lite r) of
engi ne oil.
Engine compartment275
Maintenance and care
Z

XReplacecap :on th efiller neck and tighten
clockwise.
Ensur ethat th ecap locks int oplac esecurely.
XChec kth eoil level again usin gth eoil dipstick
(except Mercedes-AM G S65) (Ypage 274).
XChec kth eoil level again wit hth eon-board
computer (Ypage 274).
Further information on engin eoil (
Ypage 331).
Additional service products
Important safety notes
GWARNIN G
Certain component sin th eengin ecompart-
ment, suc has th eengine, radiato rand part s
of th eexhaust system, can become ver yhot .
Workin gin th eengin ecompartmen tposes a
ris kof injury.
Wher epossible, let th eengin ecool down and
touch only th ecomponent sdescribe din th e
following.
GWARNIN G
The engin ecompartmen tcontain smoving
components. Certain components, suc has
th eradiato rfan ,may continue to run or start
again suddenly when th eignition is off .There
is aris kof injury.
If you need to do any wor kinside th eengin e
compartment:
Rswitch off th eignition
Rnever reac hint oth earea wher ethere is a
ris kof danger from moving components,
suc has th efan rotation area
Rremove jewelr yand watches
Rkeep items of clothing and hair ,for exam-
ple, away from moving part s
GWARNING
The coolin gsystem is pressurized, particularly
when th emotor is warm .If you open th ecap ,
you could be scalded if hot coolan tsprays out .
There is aris kof injury.
Let th eengin ecool down before you open th e
cap .Wear gloves and eye protection .Slowly
open th ecap to reliev epressure.
GWARNIN G
Opening th ehoo dwhen th eengin eis over-
heated or when there is afir ein th eengin e
compartmen tcould expos eyou to hot gase s
or other servic eproducts .There is aris kof
injury.
Let an overheate dengin ecool down before
opening th ehood. If there is afir ein th e
engin ecompartment, keep th ehoo dclosed
and contact th efir edepartment.
Checking coolant level
GWARNIN G
Certain component sin th eengin ecompart-
ment, suc has th eengine, radiato rand part s
of th eexhaust system, can become ver yhot .
Workin gin th eengin ecompartmen tposes a
ris kof injury.
Wher epossible, let th eengin ecool down and
touch only th ecomponent sdescribe din th e
following.
GWARNIN G
The coolin gsystem is pressurized, particularly
when th emotor is warm .If you open th ecap ,
you could be scalded if hot coolan tsprays out .
There is aris kof injury.
Let th eengin ecool down before you open th e
cap .Wear gloves and eye protection .Slowly
open th ecap to reliev epressure.
276Engine compartment
Maintenance and care

Example: checking the coolant level
XPark the vehicle on a level surface.
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
XTurn the SmartKey to position2in the ignition
lock (Ypage 124).
or
XOn vehicles with KEYLESS-GO, press the
Start/Stop button twice (Ypage 124).
XCheck the coolant temperature display in the
instrument cluster (Ypage 188).
The coolant temperature must be below
158 ‡ (70 †).
XTurn the SmartKey to position 0in the ignition
lock (Ypage 124).
or
XPress the Start/Stop button once on vehicles
with KEYLESS-GO (Ypage 124).
XSlowly turn cap :counter-clockwise and to
relieve excess pressure.
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 filler neck
when warm, there is enough coolant in expan-
sion 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.
For fu rther i
nformation on coolant, see
(Ypage 332).
Adding washer fluid to the windshield
washer system
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: adding fluid to the windshield
washer system
XTo open: pull cap:upwards by the tab.
XPlace cap :on the edge of the filler neck and
engage in place.
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 1.1 US qt (1.0 l),
a message appears in the multifunction display
prompting you to add washer fluid (
Ypage 230).
Further information on washer fluid
(
Ypage 333).
ASSYST PLUS
Service message
The ASSYST PLUS service interval display
informs you of the next service due date.
Information on the type of service and service
intervals (see the separate Maintenance Book-
let).
Further information can be obtained at a quali-
fied specialist workshop, e.g. an authorized
ASSYST PLUS277
Maintenance and care
Z

Mercedes-Benz Center, or at
http://www.mbusa.com (USA only).
iThe ASSYST PLUS service interval display
does not show any information on the engine
oil level. Observe the notes on the engine oil
level (
Ypage 274).
The multifunction display shows a service mes-
sage for several seconds, e.g.:
RService A in XX Days
RService A Due
RService A Overdue by XX Days
Depending on the operating conditions of the
vehicle, the remaining time or distance until the next service due date is displayed.
The letter A
orB, possibly in connection with a
number or another letter, indicates the type of
service. A
stands for a minor service and Bfor a
major service.
You can obtain further information from an
authorized Mercedes-Benz Center.
The ASSYST PLUS service interval display does
not take into account any periods of time during
which the battery is disconnected.
Maintaining the time-dependent service sched-
ule:
XNote down the service due date displayed in
the multifunction display before disconnect-
ing the battery.
or
XAfter reconnecting the battery, subtract the
battery disconnection periods from the ser-
vice date shown on the display.
Hiding a service message
XPress the aor% button on the steering
wheel.
Displaying service messages
XSwitch the ignition on.
XUse ò on the steering wheel to call up the
list of menus.
XPress 9or: on the steering wheel to
select the Servicemenu and confirm with
a.
XPress 9or: on the steering wheel to
select the ASSYST PLUSsubmenu and con-
firm with a.
The service due date appears in the multi-
function display.
Information about Service
Resetting the ASSYST PLUS service
interval display
!If the ASSYST PLUS service interval display
has been inadvertently reset, this setting can
be corrected at a qualified specialist work-
shop.
Have service work carried out as described in
the Maintenance Booklet. This may otherwise
lead to increased wear and damage to the
major assemblies or the vehicle.
A qualified specialist workshop, e.g. an author-
ized Mercedes-Benz Center, will reset the
ASSYST PLUS service interval display after the
service work has been carried out. You can also
obtain further information on maintenance
work, for example.
Special service requirements
The specified maintenance interval takes only
the normal operation of the vehicle into
account. Under arduous operating conditions or
increased load on the vehicle, maintenance
work must be carried out more frequently, for
example:
Rregular city driving with frequent intermediate
stops
Rif the vehicle is primarily used to travel short
distances
Ruse in mountainous terrain or on poor road
surfaces
Rif the engine is often left idling for long periods
Under these or similar conditions, have, for
example, the air filter, engine oil and oil filter
replaced or changed more frequently. Under
arduous operating conditions, the tires must be
checked more often. Further information can be obtained at a qualified specialist workshop, e.g.
an authorized Mercedes-Benz Center.
278ASSYST PLUS
Maintenance and care

!Make sure that the automatic transmission
is in neutral position Nwhen washing your
vehicle in a tow-through car wash. The vehicle
may otherwise be damaged.
ROperating with the SmartKey:
Do not remove the SmartKey from the igni-
tion lock. Do not open the driver's door
when the engine is switched off or at very
low speeds. Otherwise, when in transmis-
sion position Dor Rthe automatic trans-
mission will automatically switch to park
position Pand block the wheels.
ROperating with the Start/Stop button:
Do not open the driver's door when the
engine is switched off or at very low
speeds. Otherwise, when in transmission
position Dor Rthe automatic transmission
will automatically switch to park position P
and block the wheels.
Observe the following to make sure that the
automatic transmission stays in position Nneu-
tral:
Operating with the SmartKey:
XMake sure that the ignition is switched on.
XMake sure that the vehicle is stationary.
XDepress and hold the brake pedal.
XShift to neutral N.
XRelease the brake pedal.
XRelease the electric parking brake, if neces-
sary.
XSwitch off the ignition and leave the SmartKey
in the ignition lock.
Operating with the Start/Stop button:
XMake sure that the ignition is switched on.
XMake sure that the vehicle is stationary.
XDepress and hold the brake pedal.
XEngage park position P.
XRelease the brake pedal.
XRemove Start/Stop button from ignition lock
(Ypage 124).
XInsert the SmartKey into the ignition lock.
XSwitch on the ignition.
XDepress and hold the brake pedal.
XShift to neutralN.
XRelease the brake pedal.
XRelease the electric parking brake, if neces-
sary.
XSwitch off the ignition and leave the SmartKey
in the ignition lock.
You can wash the vehicle in an automatic car
wash from the very start.
If the vehicle is very dirty, pre-wash it before
cleaning it in an automatic car wash.
After using an automatic car wash, wipe off wax
from the windshield and the wiper blades. This
will prevent smears and reduce wiping noises
caused by residue on the windshield.
Washing by hand
In some countries, washing by hand is only
allowed at specially equipped washing bays.
Observe the legal requirements in each country.
XDo not use hot water and do not wash the
vehicle in direct sunlight.
XUse a soft sponge to clean.
XUse a mild cleaning agent, such as a car
shampoo approved by Mercedes-Benz.
XThoroughly hose down the vehicle with a gen-
tle jet of water.
XDo not point the water jet directly towards the
air inlet.
XUse plenty of water and rinse out the sponge
frequently.
XRinse the vehicle with clean water and dry
thoroughly with a chamois.
XDo not let the cleaning agent dry on the paint-
work.
Carefully remove all deposits of road salt as
soon as possible when driving in winter.
Power washers
GWARNING
The water jet from a circular jet nozzle (dirt
blasters) can cause invisible exterior damage
to the tires or chassis components. Compo-
nents damaged in this way may fail unexpect-
edly. There is a risk of an accident.
Do not use power washers with circular jet
nozzles to clean the vehicle. Have damaged
tires or chassis components replaced imme-
diately.
280Care
Maintenance and care

Where will I find...?
Vehicle tool kit
General notes
Apart from certain country-specific variations,
the vehicles are not equipped with a tire-change
tool kit. If your vehicle is equipped with a tire-
change tool kit, it is located in the stowage well
under the trunk floor. Some tools for changing a
wheel are specific to the vehicle. For more infor-
mation on which tire changing tools are required
and approved to perform a wheel change on
your vehicle, consult a qualified specialist work- shop.
Necessary tire-changing tools can include, for
example:
RJack
RWheel chock
RLug wrench
RRatchet wrench
RAlignment bolt
Vehicles with a TIREFIT kit
:Tire inflation compressor
;Towing eye
=Tire sealant filler bottle
XOpen the trunk lid.
XLift the trunk floor upwards (Ypage 258).
XUse the TIREFIT kit (Ypage 289).
Flat tire
Preparing the vehicle
Your vehicle may be equipped with:
Rtires with run-flat characteristics
(MOExtended tires) (Ypage 289)
Vehicle preparation is not necessary on vehi-
cles with MOExtended tires
Ra TIREFIT kit (Ypage 288)
Vehicles equipped with MOExtended tires are
not equipped with a TIREFIT kit at the factory. It
is therefore recommended that you additionally
equip your vehicle with a TIREFIT kit if you mount
tires that do not feature run-flat properties, e.g.
winter tires. A TIREFIT kit may be obtained from a qualified specialist workshop.
Information on changing and mounting wheels
(
Ypage 320).
XStop the vehicle on solid, non-slippery and
level ground, as far away as possible from
traffic.
XSwitch on the hazard warning lamps.
XSecure the vehicle against rolling away
(Ypage 140).
XIf possible, bring the front wheels into the
straight-ahead position.
XSwitch off the engine.
XOpen the driver's door.
The on-board electronics now have status 0.
This is the same as the SmartKey having been
removed.
XRemove the Start/Stop button from the igni-
tion lock (Ypage 124).
or, if the SmartKey is inserted in the ignition
lock:
XRemove the SmartKey from the ignition lock.
XMake sure that the engine cannot be started
via your smartphone (Ypage 126).
XMake sure that the passengers are not endan-
gered as they do so. Make sure that no one is near the danger area while a wheel is being
changed. Anyone who is not directly assisting
in the wheel change should, for example,
stand behind the barrier.
XGet out of the vehicle. Pay attention to traffic
conditions when doing so.
XClose the driver's door.
288Flat tire
Breakdown assistance

The vehicle will then use very little energy, thus
conserving battery power.
Charging the 12 V battery
!
Only use battery chargers with a maximum
charging voltage of 14.4 V.
!Only charge the battery using the jump-
starting connection point.
The jump-starting connection point is in the
engine compartment (
Ypage 294).
XOpen the hood.
XConnect the battery charger to the positive
terminal and ground point in the same order
as when connecting the donor battery in the
jump-starting procedure (
Ypage 294).
Keep away from fire and open flames. Do not
lean over a battery. Never charge the battery if it is still installed in the vehicle, unless you use a
battery charger which has been tested and
approved by Mercedes-Benz. A battery charger
unit specially adapted for Mercedes-Benz vehi-
cles and tested and approved by Mercedes-
Benz is available as an accessory. It permits the
charging of the battery in its installed position.
Contact an authorized Mercedes-Benz Center
for further information and availability. Read the
battery charger's operating instructions before
charging the battery.
Do not charge a battery which has been
removed at low temperatures with a battery
charger. Allow the battery to warm up gently
first, if necessary. Otherwise, the service life can
be shortened and the starting characteristics
impaired, especially at low temperatures.
Jump-starting
For the jump-starting procedure, use only the jump-starting connection point in the engine com-
partment, consisting of a positive terminal and a ground point.
GWARNING
Battery acid is caustic. There is a risk of injury.
Avoid contact with skin, eyes or clothing. Do not inhale any battery gases. Do not lean over the
battery. Keep children away from batteries. Wash away battery acid immediately with plenty of
clean water and seek medical attention.
GWARNING
During charging and jump-starting, explosive gases can escape from the battery. There is a risk of an explosion.
Particularly avoid fire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not lean over a battery.
GWARNING
During the charging process, a battery produces hydrogen gas. If a short circuit occurs or sparks
are created, the hydrogen gas can ignite. There is a risk of an explosion.
RMake sure that the positive terminal of a connected battery does not come into contact with
vehicle parts.
RNever place metal objects or tools on a battery.
RIt is important that you observe the described order of the battery terminals when connecting
and disconnecting a battery.
RWhen jump-starting, make sure that the battery poles with identical polarity are connected.
294Jump-starting
Breakdown assistance