&
WARNING Risk of inju rydue tomoving
parts
Cer tain components in the engine compart‐
ment may continue tomo veor suddenly
mo veagain even af terth e ignition has been
switched off, e.g. the cooler fan.
Ma kesure of thefo llowing before per form ing
ta sks in the engine compartmen t:#
Switch the ignition off. #
Neverto uch the danger zone sur round‐
ing moving component parts, e.g. the
ro tation area of thefa n. #
Remo vejewe lry and watches. #
Keep items of clo thing and hair away
from moving parts. &
WARNING Risk of inju ryfrom touching
component parts under voltage
The ignition sy stem and the fuel injection sys‐
te m wo rkunder high voltage. If youto uch
component parts which are under voltage,
yo u could receive an electric shoc k.#
Neverto uch component parts of the
ignition sy stem or the fuel injection sys‐
te m when the ignition is switched on. Live components of
the fuel injection sy stem
include the injec tors,fo rex ample.
Live components of the ignition sy stem include
th efo llowing:
R Ignition coils
R Spark plug connec tors
R Diagnostic soc ket &
WARNING Risk of bu rns from hot com‐
ponent parts in the engine compartment
Cer tain components in the engine compart‐
ment can be very hot, e.g. the engine, the
ra diator and parts of theex haust sy stem. #
Allow the engine tocool down and only
to uch component parts desc ribed in the
fo llowing. If
yo u ha vetocar ryout any workinthe engine
compartment, touch only thefo llowing compo‐
nents:
R Hood
R Engine oil filler opening cap
R Washer fluid reser voir cap R
Coolant expansion reser voir cap &
WARNING Risk of inju ryfrom using the
windshield wipers while the engine hood
is open
When the engine hood is open and the wind‐
shield wipers are set in motion, you can be
trapped bythe wiper linkage. #
Always switch off the windshield wipers
and ignition before opening the engine
hood. #
Park theve hicle in a safe location and on a
le ve l sur face if possible. #
Switch off the engine. #
Secure theve hicle against rolling away. &
WARNING Risk of inju rywhen the hood
is opened
When you open the hood, it may suddenly
drop into the end position.
There is a risk of injury for an yone in the
hood's range of mo vement. #
Before releasing the hood, ensure that
th e support is firm ly seated in the
holder. #
Open the hood only when there is no-
one in the hood's range of mo vement. #
Toopen: pull handle 1torelease the hood. #
Reach into thega p and push the hood catch
handle upwards. #
Open the hood and hold it up. Maintenance and care
203
#
Immedia tely rinse su rfaces that come in
con tact wi thDEF when filling with water
or remo veDEF wi tha damp clo thand
cold water.
If DEF has already cr ystallized, clean using a
spon geand cold water. If
yo u open the DEF tank, small amounts of
ammonia vapor may be released. Do not inhale
any ammonia vapor that may be released. Fill the
DEF tank only in well-ventilated areas.
DEF consum ption and filling capacity
DEF consum ption
Like fuel consum ption, DEF consum ption is highly
dependent upon driving style and operating con‐
ditions. DEF consum ption is usually within a
ra nge of 0 and 10% of the fuel consum ption. If
necessar y,DEF mu stbe refilled in acco rdance
with the instructions when there fill message is
displa yed in the instrument clus ter.This may also
be necessary between the scheduled mainte‐
nance.
To tal capacity of DEF tank Ve
hicl eT otal capacity
All model s5 .8gal (22 liters ) Exhau
stgas af tertre atment
The exhaust gas af tertre atment sy stem must be
operated in conjunction with DEF if it is tofunc‐
tion cor rectl y.
If yo u operate theve hicle without DEF or with
emissions-rele vant malfunctions, the legal MOT
appr oval is in validated. You will then probably no
longer be permitted tooperate theve hicle on
public roads.
It may be improper or punishable in some coun‐
tries tooperate a vehicle that uses no DEF or one
th at does not comply with the specifications of
th ese operating instructions.
Engine management monitors theex haust gas
af te rtre atment components for compliance with
emissions la wsand regulations. If you attem ptto
operate theve hicle without DEF, with diluted DEF
or with a dif fere nt reducing agent, this will be
de tected bythe engine management sy stem.
Other emissions- releva nt malfunctions, e.g.
me tering malfunctions or sensor er rors, are also
de tected and log ged. The engine management sy
stem subsequently
pr eve nts the engine being restar ted af ter issuing
a wa rning message.
Therefore add DEF tank regular lyduring vehicle
operation or, at the latest, af terre ceiving thefirst
wa rning message via the instrument clus ter. Engine oil
Note
s on engine oil
Obser vethe no tes on operating fluids
(/ page 263). *
NO
TEEngine damage caused byan
incor rect oil filter, incor rect oil or addi‐
tives #
Do not use engine oils or oil filters other
th an those which meet the specifica‐
tions necessary forth e prescribed
service inter vals. #
Do not alter the engine oil or oil filter in
order toachie velonger change inter vals
th an presc ribed. #
Do not use additives. #
Have the engine oil changed af terthe
prescribed inter vals. Mercedes-Benz
recommends having the oil
ch anged at a qualified specialist workshop.
Fu rther information on engine oil and oil filter:
R inthe MB Specifications for operating fluidsat
http://be vo.mercedes-benz.com (by entering
th e designation)
R at a qualified specialist workshop Te
ch nical da ta267
