2019 MERCEDES-BENZ AMG GT ROADSTER engine

Engine compartment
Hood
Important safety notes G
WARNING
If the hood is unlatched, it may open up when the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. Before
every trip, ensure that the hood is locked. G
WARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There is a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement. G
WARNING
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. G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There is a risk of injury.
If you need to do any work inside the engine
compartment:
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area R
remove jewelry and watches
R keep items of clothing and hair, for exam-
ple, away from moving parts G
WARNING
The ignition system and the fuel injection sys- tem work under high voltage. If you touch
components which are under voltage, you
could get an electric shock. There is a risk of
injury.
Never touch components of the ignition sys-
tem or fuel injection system when the ignition is switched on.
Opening the hood G
WARNING
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. G
WARNING
When the hood is open and the windshield
wipers are set in motion, you can be injured by the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
! Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield wip-
ers or the hood. Engine compartment
235Maintenance and care Z

X
Make sure that the windshield wipers are
turned off.
X Pull release lever 0043on the hood.
The hood is released. X
Reach into the gap, pull hood catch handle 0044
up and lift the hood.
If you lift the hood, the hood is opened and
held open automatically by the gas-filled
strut.
Closing the hood G
WARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There is a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement.
X Lower the hood and let it fall from a height of
approximately 8 in (20 cm).
X Check that the hood has engaged properly.
If the hood can be raised slightly, it is not
properly engaged. Open it again and close it
with a little more force. Engine oil
Notes on the oil level Depending on your driving style, the vehicle
consumes up to 0.9 US qt (0.8 liters) of oil per
600 miles (1,000 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.
It is only possible to correctly measure the oil
level when:
R the engine is at normal operating temperature
R the vehicle is parked on a level surface
R the engine is left running in neutral for at least
30 seconds before switching off
This applies when checking the oil level using
the oil dipstick or on-board computer.
Checking the oil level using the oil dip-
stick G
WARNING
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.
It is only possible to correctly measure the oil
level with the oil dipstick when the engine is at
normal operating temperature and in a period of 2 to minutes after the engine has been switchedoff. 236
Engine compartmentMaintenance and care

X
Pull oil dipstick 0043out of the dipstick guide
tube.
X Wipe off oil dipstick 0043. X
Slowly slide oil dipstick 0043into the guide tube
to the stop, and take it out again.
If the level is between MIN mark 0087and MAX
mark 0044, the oil level is correct.
X If the oil level has dropped to MIN mark 0087or
below, add 1.1 US qt (1.0 liter) engine oil.
Checking the oil level using the on-board computer Calling up the oil level measurement
X Select key position 0048with the Start/Stop button.
X Use 00E2 on the steering wheel to call up the list of menus.
X Press the 0064or0063 button on the steering wheel to select the Service
Service menu.
X Confirm by pressing 0076on the steering wheel.
X Use 0064 or0063 to select the Engine Oil Level
Engine Oil Level submenu.
X Press 0076to confirm the selection.
The Measuring Engine Oil Level Accurate Only When Vehicle Is Level
Measuring Engine Oil Level Accurate Only When Vehicle Is Level message
appears in the multifunction display.
The measurement takes a few seconds. You will see a message in the multifunction display. The
messages are explained in the following chapter.
Engine oil level display messages Display messages
Possible causes/consequences and
0050 0050Solutions Engine Oil Level OK
Engine Oil Level OK The engine oil level is correct.
Check Engine Oil
Check Engine Oil
Level (Add 1 Liter) Level (Add 1 Liter) The engine oil level is too low.
X Add 1.1 US qt (1.0 liter) of engine oil. Reduce Engine Oil
Reduce Engine Oil
Level Level The engine oil level is too high.
X Have excess engine oil siphoned off. For Engine Oil
For Engine Oil
Level Level
Ignition
Ignition Must
Must
Be On
Be On The ignition is switched off.
X Select key position 0048with the Start/Stop button. Need More Time to
Need More Time to
Check Engine Oil Check Engine Oil
Level Level The required waiting period was not observed.
X The engine must be at regular operating temperature.
Measurements can only be taken within the first four minutes after
the engine has been switched off. Engine Oil Level
Engine Oil Level
Not Not
Measurable
Measurable with
with
Engine Running
Engine Running The engine is running; oil level measurement is not possible.
X Switch off the engine.
X Repeat the measurement. Observe the required waiting period. Engine compartment
237Maintenance and care Z

Display messages
Possible causes/consequences and
0050
0050Solutions Engine Oil Level
Engine Oil Level
Correct Correct
Measurement
Measurement
Only if Vehicle Is
Only if Vehicle Is
on Level Ground on Level Ground The vehicle is not parked on a level surface.
X Park the vehicle on a level surface. Engine Oil Level
Engine Oil Level
Not Measurable Not Measurable Oil level measurement with the oil dipstick is possible. The measuring
system is malfunctioning.
X Visit a qualified specialist workshop. Adding engine oil
G
WARNING
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. G
WARNING
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. H
Environmental 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:
R Use of engine oils and oil filters that have
not been expressly approved for the service
system
R Replacement of engine oil and oil filter after
the replacement interval specified by the
service system has expired
R Use 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
X Turn cap 0043counter-clockwise and remove it.
X Add 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.
X Replace cap 0043on the filler neck and turn
clockwise.
Ensure that the cap locks into place securely.
X Check the oil level again with the oil dipstick
(Y page 236).
Further information on engine oil (Y page 291).238
Engine compartmentMaintenance and care

Additional service products
Checking coolant level G
WARNING
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. G
WARNING
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. G
WARNING
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 protective gloves and protective
eyewear when opening. Open the cap slowly
to release pressure.
! Before starting your journey, make sure that
all engine covers are installed. Otherwise, the engine can be damaged, e.g. through over-
heating. Example
X Park 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.
X Select key position 0048with the Start/Stop
button.
X Check the coolant temperature display in the
instrument cluster.
The coolant temperature must be below
158 ‡ (70 †).
X Select key position 0092with the Start/Stop
button.
X Remove engine cover 0043upwards on both
sides.
X Slowly turn cap 0044half a turn counter-clock-
wise to allow excess pressure to escape.
X Turn cap 0044further counter-clockwise and
remove it.
If the coolant is at the level of the marker bar in the filler neck when cold, there is enough
coolant in coolant expansion tank 0087.
If the coolant level is approximately 0.6 in
(1.5 cm) above the marker bar in the filler
neck when warm, there is enough coolant in
coolant expansion tank 0087.
X If necessary, add coolant that has been tested
and approved by Mercedes-Benz. Engine compartment
239Maintenance and care Z

X
Replace cap 0044and turn it clockwise as far as
it will go.
X Replace engine cover 0043.
For further information on coolant, see
(Y page 292).
Windshield washer system G
WARNING
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. G
WARNING
Windshield washer concentrate is highly flam- mable. If windshield washer concentrate getsonto hot components of the engine or the
exhaust system, it can ignite. There is a risk of
fire and injury.
Make sure that windshield washer concen-
trate is not spilled in the vicinity of the filler
neck. Example
X To open: pull cap0043upwards by the tab.
X Add the premixed washer fluid.
X To close: press cap 0043onto the filler neck
until it engages.
If the washer fluid level drops below the recom- mended minimum of 1 liter, a message appears
in the multifunction display prompting you to
add washer fluid (Y page 197). Further information on windshield washer fluid/
antifreeze (Y page 292). ASSYST PLUS
Service message
i If the scheduled service intervals are excee-
ded, this may result in damage to the vehicle.
You can obtain up-to-date information concern-
ing the servicing of your vehicle from a qualified specialist workshop, e.g. an authorized
Mercedes-Benz Service Center or at
http://www.mbusa.com (USA only).
The ASSYST PLUS service interval display
informs you of the next service due date.
i The ASSYST PLUS service interval display
does not show any information on the engine oil level. Observe the notes on the engine oil
level (Y page 236).
The multifunction display shows a service mes-
sage for several seconds, e.g.: R Service A in XX Days Service A in XX Days
R Service A Due
Service A Due
R Service A Overdue by XX Days
Service 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 Aor B
B, possibly in connection with a
number or another letter, shows the type of ser-
vice. A
Astands for a minor service and B
Bfor a
major service.
You can obtain further information from an
authorized Mercedes-Benz Service 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:
X Note down the service due date displayed in
the multifunction display before disconnect-
ing the battery.
or
X After reconnecting the battery, subtract the
battery disconnection periods from the ser-
vice date shown on the display. 240
ASSYST PLUSMaintenance and care

Hiding a service message
X Press the 0076or0038 button on the steering
wheel. Displaying service messages
X Switch on the ignition.
X Use 00E2 on the steering wheel to call up the
list of menus.
X Press 0063or0064 on the steering wheel to
select the Service Servicemenu and confirm with
0076.
X Press 0063or0064 on the steering wheel to
select the ASSYST PLUS
ASSYST PLUS submenu and con-
firm with 0076.
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 Service 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:
R Regular city driving with frequent intermedi-
ate stops
R If the vehicle is primarily used to travel short
distances R
Use in mountainous terrain or on poor road
surfaces
R If the engine is often left idling for long periods
R In racetrack mode
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 Service Center.
i In racetrack mode, the vehicle is subject to
higher loads, meaning that additional main-
tenance work is required. If you plan race-
track use, consult a qualified specialist work-
shop first. Mercedes-Benz recommends that
you use an authorized Mercedes-Benz Ser-
vice Center for this purpose.
Driving abroad An extensive Mercedes-Benz Service network is
also available in other countries. You can obtain further information from any authorized
Mercedes-Benz Service Center. Care
General notes
H
Environmental note
Dispose of empty packaging and cleaning
cloths in an environmentally responsible man-
ner.
! When cleaning your car, do not use:
R dry, coarse or hard cloths
R abrasive cleaning agents
R solvents
R cleaning agents containing solvents
Do not scrub.
Do not touch the surfaces and films with hard
objects, e.g. rings or ice scrapers. Otherwise,
you may scratch or damage the surfaces and films.
! Do not park your vehicle for a long period of
time directly after cleaning, particularly after
cleaning the wheel rim with wheel cleaner.
Wheel cleaner can lead to the increased cor-
rosion of the brake discs and pads. Therefore, Care
241Maintenance and care Z

drive for a few minutes after cleaning. By
heating up the brakes, the brake discs and
pads dry. The vehicle can then be parked for a
long period of time.
Regular care of your vehicle is a condition for
retaining the quality in the long term.
Use care products and cleaning agents recom-
mended and approved by Mercedes-Benz. Washing the vehicle and cleaning the
paintwork
Automatic car wash G
WARNING
Braking efficiency is reduced after washing
the vehicle. There is a risk of an accident.
After the vehicle has been washed, brake
carefully while paying attention to the traffic
conditions until full braking power is restored.
! When Active Brake Assist, Active Distance
Assist DISTRONIC or the HOLD function is
activated, the vehicle brakes automatically in
certain situations.
To avoid damage to the vehicle, deactivate
these systems in the following or similar sit-
uations:
R when towing the vehicle
R in the car wash
! Preferably use automatic car washes with
adjustable high-pressure pre-cleaning. This
corresponds with the specification for the
Cabriolet program. In car washes that use
high water pressures, there is a risk that a
small amount of water may leak into the vehi- cle.
! Make sure that the vehicle is not subse-
quently treated with hot wax.
! Never clean your vehicle in a Touchless
Automatic Car Wash as these use special
cleaning agents. These cleaning agents can
damage the paintwork or plastic parts.
If you have your vehicle cleaned in a high-
pressure automatic car wash, small amounts of water may enter the vehicle. !
If the SmartKey is within the rear detection
range of KEYLESS-GO, the following situa-
tions, for example, could lead to the uninten-
tional opening of the trunk lid:
R when using an automatic car wash
R when using a power washer
Make sure that the SmartKey is at least 10 ft
(3 m) away from the vehicle.
! Make sure that:
R the side windows are fully closed
R the blower of the ventilation/heating sys-
tem is switched off
R the windshield wiper switch is at position
003F
R the rear-view camera is deactivated
The vehicle may otherwise be damaged.
! When washing your vehicle in a tow-through
car wash, use the SmartKey instead of the
Start/Stop button.
Start the engine using the SmartKey. Set the
transmission to 005Cwith the E-SELECT selec-
tor lever. Switch the engine off again with the SmartKey by turning the SmartKey to position
0048. Make sure that you then leave the Smart-
Key in position 0048. You may otherwise dam-
age the vehicle, the transmission or the car
wash.
Check the transmission position in the instru-
ment cluster.
! Before switching off the engine, use the
E‑SELECT lever to shift the transmission to
005C. If you open the driver's or front-passenger
door, the transmission remains in this posi-
tion for up to 30 minutes if the key is in the
ignition, even if the engine is switched off. If
you do not shift the transmission to 005Cusing
the E‑SELECT lever beforehand, it shifts auto-
matically to parking position 005Dand locks the
wheels if the driver's or front-passenger door
is opened when the engine is switched off.
This may damage the vehicle, the transmis-
sion or the car wash.
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. 242
CareMaintenance and care