Page 267 of 350

engine or to the catalytic converter. Have
excess engine oil siphoned off.
Example
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 l)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 dip-
stick (
Ypage 264).
Further information on engine oil
(
Ypage 341).
Additional 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 engine cooling system is pressurized, par-
ticularly when the engine is warm. When
opening the cap, you could be scalded by hot
coolant spraying out. There is a risk of injury.
Let the engine cool down before opening the
cap. Wear eye and hand protection when
opening the cap. Open the cap slowly half a
turn to allow pressure to escape.
XPark the vehicle on a level surface.
Only check the coolant level when the vehi-
cle is on a level surface and the engine has
cooled down.
XTurn the SmartKey to position 2in the igni-
tion lock (
Ypage 137).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (
Ypage 138).
XCheck the coolant temperature display in
the instrument cluster.
The coolant temperature must be below
158 ‡ (70 †).
XTurn the SmartKey to position 0in the igni-
tion lock (
Ypage 137).
XSlowly turn cap :half a turn counter-
clockwise 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 filler
Engine compartment265
Maintenance and care
Z
Page 273 of 350

RAlignment bolt
ROne pair of gloves
RLug wrench
RTowing eye
Vehicles with a collapsible spare wheel
(Example: equipment and country-specific varia-
tions possible)
:
Towing eye
;One pair of gloves
=Jack
?Folding wheel chock
AAlignment bolt
BSheet for faulty wheel
CTire inflation compressor
DLug wrench
EFuse allocation chart
XOpen the trunk lid/tailgate.
XSedan:lift up the floor of the trunk
(
Ypage 248).
XWagon: remove the seat cushions of the
folding bench seat; see the Digital Opera-
tor's Manual, keyword "Folding bench seat
(cargo compartment)".
Flat tire
Preparing the vehicle
Your vehicle may be equipped with:
RMOExtended tires (tires with run-flat prop-
erties) (
Ypage 272) Vehicle preparation is not necessary on
vehicles with MOExtended tires
Ra TIREFIT kit (Ypage 270)
Ran emergency spare wheel (Ypage 329)
Vehicles equipped with MOExtended tires are
not equipped with a TIREFIT kit at the factory. It is therefore recommended that you addi-
tionally 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 work-
shop.
Information on changing/mounting a wheel
(
Ypage 309).
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 151).
XIf possible, bring the front wheels into the
straight-ahead position.
XVehicles with AIRMATIC: make sure that
"normal" level is selected (
Ypage 166).
XSwitch off the engine.
XRemove the SmartKey from the ignition
lock.
or, on vehicles with KEYLESS ‑GO:
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
ignition lock (
Ypage 138).
XMake sure that the passengers are not
endangered 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 bar-
rier.
XGet out of the vehicle. Pay attention to traf-
fic conditions when doing so.
XClose the driver's door.
Flat tire271
Roadside Assistance
Page 285 of 350

XTake cover:off the opening.
XScrew in the towing eye clockwise as far as
it will go and tighten it.
Removing the towing eye
XUnscrew and remove the towing eye.
XAttach cover :to the bumper and press
until it engages.
XPlace the towing eye in the vehicle tool kit.
Towing a vehicle with both axles on
the ground
It is important that you observe the safety
instructions when towing away your vehicle
(
Ypage 281).
The automatic transmission automatically
shifts to position Pwhen you open the driver's
or front-passenger door or when you remove
the SmartKey from the ignition lock. In order
to ensure that the automatic transmission
stays in position Nwhen towing the vehicle,
you must observe the following points:
XMake sure that the vehicle is stationary and
the SmartKey in the ignition lock is in posi- tion 0.
XTurn the SmartKey to position 2in the igni-
tion lock.
On vehicles with KEYLESS-GO, use the
SmartKey instead of the Start/Stop button
(
Ypage 139).
XDepress and hold the brake pedal.
XShift the automatic transmission to posi-
tion N.
XRelease the brake pedal.
XRelease the parking brake.
XSwitch on the hazard warning lamps, see
the Digital Operator's Manual.
XLeave the SmartKey in position 2in the
ignition lock.
iWhen towing with the hazard warning
lamps switched on, use the combination
switch as usual to signal a change of direc- tion. In this case, only the indicator lamps
for the direction of travel flash. After reset-
ting the combination switch, the hazard
warning lamp starts flashing again.
Towing the vehicle with the rear axle
raised
!
Vehicles with 4MATIC must not be towed
with either the front or the rear axle raised,
as doing so will damage the transmission.
!Vehicles with automatic transmission
must not be towed with the rear axle raised.
The vehicle/trailer combination may oth-
erwise swerve or even roll over.
!The ignition must be switched off if you
are towing the vehicle with the rear axle
raised. Intervention by ESP
®could other-
wise damage the brake system.
Transporting the vehicle
!
You may only secure the vehicle by the
wheels, not by parts of the vehicle such as
axle or steering components. Otherwise,
the vehicle could be damaged.
The towing eye can be used to pull the vehicle
onto a trailer or transporter for transporting
purposes.
XTurn the SmartKey to position 2in the igni-
tion lock.
XShift the automatic transmission to posi-
tion N.
As soon as the vehicle has been loaded:
XPrevent the vehicle from rolling away by
applying the parking brake.
XShift the automatic transmission to posi-
tion P.
XTurn the SmartKey to position 0in the igni-
tion lock and remove the SmartKey from
the ignition lock.
XSecure the vehicle.
Towing and tow-starting283
Roadside Assistance
Z
Page 312 of 350

XBring the front wheels into the straight-
ahead position.
XShift the transmission to positionP.
XVehicles with AIRMATIC: make sure that
"normal" level is selected (
Ypage 166).
XSwitch off the engine.
XRemove the SmartKey from the ignition
lock.
or, on vehicles with KEYLESS ‑GO:
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
ignition lock (
Ypage 138).
XIf included in the vehicle equipment,
remove the tire-change tool kit from the
vehicle (
Ypage 270).
XSafeguard the vehicle against rolling away.
Securing the vehicle to prevent it from
rolling away
If your vehicle is equipped with a wheel chock,
it can be found in the tire-change tool kit
(
Ypage 270).
The folding wheel chock is an additional
safety measure to prevent the vehicle from
rolling away, for example when changing a
wheel.
XFold both plates upwards :.
XFold out lower plate;.
XGuide the lugs on the lower plate fully into
the openings in base plate =.
Securing the vehicle on level ground (example:
Sedan)
XOn level ground:place chocks or other
suitable items under the front and rear of
the wheel that is diagonally opposite the
wheel you wish to change.
Securing the vehicle on slight downhill gradients
(example: Sedan)
XOn light downhill gradients: place
chocks or other suitable items in front of
the wheels of the front and rear axle.
Raising the vehicle
GWARNING
If you do not position the jack correctly at the
appropriate jacking point of the vehicle, the
jack could tip over with the vehicle raised.
There is a risk of injury.
Only position the jack at the appropriate jack-
ing point of the vehicle. The base of the jack
must be positioned vertically, directly under
the jacking point of the vehicle.
310Changing a wheel
Wheels and tires
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