clogging
.Deposits ma yalsof ormont he fuel
injector .This ma yreduce thee ngine output.
Unburned fuel can getint ot he oil pan. This
causes thee ngine oil le veltor ise. This can
cause engin emechanical damage.
Obser vethef ollowing points to avoid damage
and reducing thee ngine output: #
Fill up wit hfuels wit hbio-diesel content
of 5% (ULSD) or less, whene verp ossi‐
ble. #
Regular lych ecky our engine oil le velif
yo uu se B2 0fuels on aregular basis. #
Strictl yfollo wthe oil chang einter vals
qu oted in thei nstrument clus tera nd
within your Main tenance Bookl et. #
Use only engine oils and filters
appr ovedfor use in your vehicle. #
Ifyo udon otplan todriv eyour vehicle
fo rs everal weeks, comple tely fill the
fuel tank in ad vance wi thULSD fuel. Fo
rm orei nformation, consult theg asstation
st aff. The identification of fuels wit hbio-diesel
con tent (ULSD or B20) mus tbec lear .Ift he iden‐
tification is no tclear ,don otrefuel .Don otrefuel
wit ha nyfuel sthat ha venotb eena pprove df or
yo ur vehicle.
Ta nk content and fuel reser ve
The total capacity of thef uel tank ma yvary,
depending on thev ehicle equipment.
Ta nk content and fuel reser ve Gasoline engine
Total capacity
M2 74 approx.2 2.5 gal
(85 liters) Diesel engine
Total capacity
OM6 51/OM642 appr ox.2 4.5 gal
(93 liters) Gasoline engine Of whic
hreser ve
fuel
Model switha ppr ox.
22.5 gal(85 l) total
capacity appr
ox.5g al
(1 9l iters) Diesel engine Of whic
hreser ve
fuel
Model switha ppr ox.
24 .5 gal(93 l) total
capacity appr
ox.5g al
(1 9l iters) DEF
Note
sonD EF
Obser vethen otes on operating fluids
(/ page247).
DEF is awater-soluble fluid fort he exhaus tgas
af te rtre atment of diese lengines.
* NO
TEDama gecaused byadditives in
DE Forbyd iluting DEF The DEFe
xhaustgasa ftertreatment sy stem
could be destr oyed bythef ollowing:
R Additives in DEF
R Dilutin gDEF #
Onlyuse DEFina ccordance wit hISO
222 41 . #
Do no tmix additives. #
Do no tdilut eD EF. *
NO
TEDama geand malfunctions caused
by impurities in DEF Impurities in DE
Fresult in thef ollowing:
R Higher emission values
R Damag etothe catalytic con verter
R Engine damage
R Malfunctions in theD EFexhaus tgas
af te rtre atment sy stem #
Avoid impurities in DEF. +
ENVIRONMENTAL
NOTESoiling wi th
DEF DEF
residue cr ystallizes af ters ome time and
st ain thea ffected sur faces. 250
Tech nica ldata
#
Immedia tely rinse su rfaces that com ein
con tact wi thDEF when filling wit hwater
or remo veDEF wi thad am pcloth and
col dw ater.
If DEF has alread ycrystallized, clean using a
spon geand col dwater. If
yo uo pen theD EFtank ,small amounts of
ammoni avapor ma ybereleased. Do no tinhale
an ya mmonia vapor that ma ybereleased. Fill the
DEF tank only in well-ventilated areas.
DEF consum ption and filling capacity
DEF consum ption
Lik efuel consum ption, DE Fconsum ption is highly
dependent upon driving stylea nd operating con‐
ditions. DEFc onsumption is usuall ywithin a
ra ng eof0a nd10%oft he fuel consum ption. If
necessar y,DEF mu stbe refilled in acco rdance
wit hthe instructions when ther efill messag eis
displa yedint he instrument clus ter.This ma yalso
be necessar ybetwe en thes cheduled mainte‐
nance.
To tal capacity of DEF tank Ve
hicl eT otal capacity
All model s5 .8gal(22 liter s) Exhau
stgasa ftertreatment
The vehicle mus tbeoperated wit hDEF if the
ex haus tgas af tertre atment sy stem is tofunction
cor rectl y.
If yo uo perat ethe vehicle without DEF or with
emissions-rele vant malfunctions ,the legal MOT
appr oval is in validated. The vehicle could be pro‐
hibited from publicr oad usebyan of ficia lordi‐
nance.
It ma ybei mprop eror punishable in some coun‐
tries tooperat eavehicle that uses no DE Forone
th at does no tcompl ywitht he specifications of
th ese operating instructions.
Engine management monitor sthe exhaus tgas
af te rtre atment component sfor compliance with
emiss ions la wsand regulations. If youa ttem ptto
operat ethe vehicle without DEF ,withd iluted DEF
or wit hadiffe re nt reducing agent ,this will be
de tected bythee ngine management sy stem.
Other emissions- releva nt malfunctions ,e.g.
me tering malfunctions or sensor er rors,a re also
de tected and log ged. The engin
emanagement sy stem subsequently
pr eve nts thee ngine being restar teda fter issuing
aw arning message.
Therefor eadd DE Ftank regular lyduring vehicle
operation or ,atthe latest, af terr eceiving thef irst
wa rning messag eviathei nstrument clus ter. Engine oil
Note
sone ngine oil
Obser vethen otes on operating fluids
(/ page247). *
NO
TEEngine damag ecaused byan
incor rect oil filter ,incor rect oil or addi‐
tives #
Do no tuse engine oil soroilfilter sother
th an those whic hmeetthe specifica‐
tions necessar yfor thep rescribed
service inter vals. #
Do no talter thee ngine oil or oil filter in
order toachie velonger chang einter vals
th an presc ribed. #
Do no tuse additives. #
Have thee ngine oil changed af tert he
prescribed inter vals. Mercedes-Benz
recommends having theo il
ch anged at aqualified specialis tworks hop.
Fu rther information on engine oil and oil filter:
R intheMBS pecification sfor operating fluidsat
http://be vo.mercedes-benz.com (b yentering
th ed esignation)
R ataq ualified specialis tworks hop Te
ch nica ldata 251
