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Engine compartment
161G 320 CDI
1
Cap
X Unscrew cap 1and remove it.
X Top up with the amount of oil required.
! Do not add too much oil. If too much oil
is added and the oil level is above the max-
imum mark on the dipstick, the engine or
catalytic converter could be damaged.
Have excess oil siphoned off.
X Screw cap 1onto the filler neck. H
Environmental note
When topping up the oil, take care not to
spill any. Oil must not be allowed to escape
into the soil or waterways. You would oth-
erwise be damaging the environment. Oil level in the automatic transmis-
sion
There is no need for you to check the oil level
in the automatic transmission. In the event of
oil loss or problems with gearshifts, have the
automatic transmission checked at a quali-
fied specialist workshop, e.g. at a Mercedes-
Benz Service Centre. Coolant
G
Risk of injury
The cooling system is pressurised. There-
fore, only unscrew the cap once the engine
has cooled down. This means the coolant
temperature gauge must display less than
70 °C. You could otherwise be scalded by
escaping hot coolant.
Coolant consists of water and antifreeze/cor-
rosion inhibitor. Only check the coolant level
when the vehicle is on a level surface and the
engine has cooled down. Checking the coolant level The expansion tank is located in the engine
compartment on the right-hand side of the
vehicle when viewed in the direction of travel.
1
Cap
X Slowly turn cap 1by half a turn in the
direction of the arrow to release excess
pressure.
X Unscrew cap 1completely and remove it.
X Turn cap 2further anti-clockwise and
remove it.
There is sufficient coolant in the expansion
tank if the coolant is level with the mark in
the expansion tank when the coolant is cold
or approximately 1.5 cm higher when hot. Operation
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Page 183 of 293

Trailer towing*
180 G
Risk of accident
On no account should you attempt to draw
the vehicle/trailer combination out by
increasing speed. Trailer po
wer supply
The trailer socket of your vehicle is equipped
at the factory with a permanent power supply.
The permanent power supply is supplied via
trailer socket pin 9.
! You can connect accessories with a max-
imum power consumption of 180 W to the
permanent power supply.
You must not charge a trailer battery using
the power supply.
You can obtain further information about
installing the trailer electrics from a qualified
specialist workshop, e.g. a Mercedes-Benz
Service Centre. Trailer with 7-pin connector
If your trailer has a 7-pin connector, you can
connect it to the 13-pin socket on the ball
coupling using an adapter or, if necessary, an
adapter cable. Both of these can be obtained
at a qualified specialist workshop, e.g. at a
Mercedes-Benz Service Centre.
Fitting the adapter 1
Connector with lug
2 Socket with groove
X Open the socket cover.
X Insert the connector with lug 1into
groove 2on the socket and turn the con-
nector clockwise to the stop. X
Make the cover engage.
X If you are using an adapter cable, secure
the cable to the trailer with cable ties.
! Make sure that there is sufficient cable
play so that the cable cannot become
detached when cornering.
i When socket 2is connected, the ultra-
sound reversing aid is deactivated. Operation
* optional
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Where will I find...?
1911
Bar
2 Tab
3 Jack
X Pull bar 1upwards and detach from tab
2.
X Remove jack 3.
Cabriolet Warning triangle, first-aid kit and vehicle
tool kit
The warning triangle, first aid kit and vehicle
tool kit are located behind a cover in the tail-
gate. 1
Handle
2 Cover
X Open the tailgate (Y page 58).
X Fold out handle 1in the direction of the
arrow.
X Turn handle 1clockwise and fold up cover
2 in the direction of the arrow. 1
Warning triangle
2 First-aid kit
3 Vehicle tool kit
X Remove warning triangle 1, first-aid kit
2 or vehicle tool kit 3.
X Set up the warning triangle (Y page 188).
Jack
The jack is located behind a cover in front of
the front-passenger seat (as in the short-
wheelbase station wagon) (Y page 190). Practical advice
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Locking/unlocking in an emergency
229Locking/unlocking in an emergency
Emergency key
If the vehicle can no longer be locked or
unlocked with the key, use the emergency
key element.
If you use the emergency key element to
unlock and open the driver's door, the anti-
theft alarm system* will be triggered
(Y page 51).
There are several ways to turn off the alarm:
X Press the korj button on the key.
or
X Insert the key into the ignition lock.
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically.
X To unlock the fuel filler flap: insert the
key in the ignition lock. Releasing and removing the emergency
key element 1
Release catch
2 Emergency key element
X Push release catch 1in the direction of
the arrow and at the same time remove
emergency key element 2from the key. Unlocking the vehicle
If the vehicle can no longer be unlocked cen-
trally with the key:
X Remove the emergency key element from
the key (Y page 229).
Unlocking the driver's door X
Insert the emergency key element into the
lock of the driver's door as far as it will go.
X Turn the emergency key element anti-
clockwise.
The door is unlocked.
X Turn the emergency key element back and
remove it.
Unlocking the rear door (station wagon) X
Insert the emergency key element into the
driver's door lock as far as it will go.
X Turn the emergency key element anti-
clockwise.
The door is unlocked.
X Turn the emergency key element back and
remove it. Practical advice
* optional
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Locking/unlocking in an emergency
230 Locking the vehicle
If the vehicle can no longer be locked cen-
trally with the key:
X Close the front-passenger door, the rear
doors and the rear door or tailgate (Cabrio-
let).
X Press the locking button (Y page 55).
X Check whether the locking knobs on the
doors are still visible. Press the locking
knobs down manually if necessary.
X Close the driver's door.
X Remove the emergency key element from
the key (Y page 229).
X Insert the emergency key element into the
lock of the driver's door as far as it will go.
X Turn the emergency key element clockwise
as far as possible.
X Turn the emergency key element back and
remove it.
X Check if the doors including the rear door
or tailgate (Cabriolet) are locked. Emergency fuel filler flap release
G
Risk of injury
The corners of the vehicle walls may be
sharp-edged. You could injure yourself
while carrying out an emergency release of
the fuel filler flap. Avoid contact with the
edges of the vehicle walls.
Station wagon The emergency release is located in the lug-
gage compartment, on the left-hand side
when viewed in the direction of travel, behind
the rear wall trim.
1
Edge protection
2 Rear wall trim X
Open the rear door.
X Pull off edge protection 1on the door pil-
lar.
X Remove rear wall trim 2.
i On vehicles with stowage lockers*, you
must first unscrew the retaining screws
inside the stowage locker. 3
Emergency release
X Pull yellow emergency release 3in the
direction of the arrow.
The fuel filler flap is unlocked.
X Open the fuel filler flap. Practical advice
* optional
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Locking/unlocking in an emergency
231
Cabriolet The emergency release is located in the lug-
gage compartment, on the left-hand side
when viewed in the direction of travel. 1
Release knob
X Pull release knob 1upwards.
The fuel filler flap is unlocked.
X Open the fuel filler flap. Operating the sliding/tilting sunroof*
manually
The drive is located in the load compartment,
on the left-hand side behind the rear wall trim. 1
Edge protection
2 Rear wall trim
X Open the rear door.
X Pull off edge protection 1on the door pil-
lar.
X Remove rear wall trim 2.
i On vehicles with stowage lockers* you
must first unscrew the retaining screws
inside the stowage lockers. 3
Box spanner (vehicle tool kit)
4 Screwdriver (vehicle tool kit)
X Place box spanner 3onto the drive hex-
agonal nut.
X Insert screwdriver 4into the box spanner
and use it as a lever.
X To open: turn box spanner anti-clockwise.
X To close: turn box spanner clockwise. Practical advice
* optional
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Changing the bulbs
2384
Screws
5 Adjustment screws
X Remove screws 4.
i Only remove screws 4. Do not turn
adjustment screws 5. If adjustment screw
5 is turned, the front foglamp adjustment
must be checked at a qualified specialist
workshop, e.g. a Mercedes-Benz Service
Centre.
X Remove headlamp 3. 6
Bulb holder
X Lightly press bulb holder 6, turn it anti-
clockwise and pull it out. 7
Bulb
X Remove bulb 7from bulb holder 6.
X Insert the new bulb into bulb holder 6.X
Insert bulb holder 6and turn it clockwise.
X Insert headlamp 3.
X Replace and tighten screws 4.
X Position cover 2.
X Replace and tighten screws 1.
Changing the bulbs in the foglamp/cor-
nering light with foglamp function 1
Screws
2 Cover
3 Headlamps
X Switch off the lights.
X Remove screws 1.
X Remove cover 2. Practical advice
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Changing the bulbs
2394
Screws
5 Adjustment screw
X Remove screws 4.
i Only remove screws 4. Do not turn
adjustment screw 5. If adjustment screw
5 is turned, the front foglamp adjustment
must be checked at a qualified specialist
workshop, e.g. a Mercedes-Benz Service
Centre.
X Remove headlamp 3. 6
Bulb holder
X Hold headlamp 3.
X Lightly press bulb holder 6, turn it anti-
clockwise to the stop and pull it out. 7
Bulb X
Remove bulb 7from bulb holder 6.
X Insert the new bulb into bulb holder 6.
X Insert bulb holder 6into headlamp 3and
turn it clockwise to the stop.
X Insert headlamp 3.
X Replace and tighten screws 4.
X Position cover 2.
X Replace and tighten screws 1.
Replacing the turn signal lamps 1
Screws
2 Lens
X Switch off the lights.
X Remove screws 1.
X Remove lens 2. Practical advice
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