clogging. Deposits may also
form onthe fuel
injec tor.This may reduce the engine output.
Unburned fuel can get into the oil pan. This
causes the engine oil le velto rise. This can
cause engine mechanical damage.
Obser vethefo llowing points to avoid damage
and reducing the engine output: #
Fill up with fuels with bio-diesel content
of 5% (ULSD) or less, whene ver possi‐
ble. #
Regular lych eck your engine oil le vel if
yo u use B20 fuels on a regular basis. #
Strictly follow the oil change inter vals
qu oted in the instrument clus ter and
within your Main tenance Bookl et. #
Use only engine oils and filters
appr ovedfo r use in your vehicle. #
Ifyo u do not plan todrive your vehicle
fo r se veralwe eks, comple tely fill the
fuel tank in ad vance wi thULSD fuel. Fo
r more information, consult thega sst ation
st aff. The identification of fuels with bio-diesel
con tent (ULSD or B20) must be clear. If the iden‐
tification is not clear, do not refuel. Do not refuel
with any fuels that ha venot been appr ovedfor
yo ur vehicle.
Ta nk content and fuel reser ve
The total capacity of the fuel tank may vary,
depending on theve hicle equipment.
Ta nk content and fuel reser ve Gasoline engine
Total capacity
M2 74 approx. 22 gal
(85 liters) Diesel engine
Total capacity
OM6 51/OM642 appr ox.24 .5 gal
(93 liters) Gasoline engine Of which
reser ve
fuel
Models with appr ox.
19 gal (85 l) total
capacity appr
ox. 5 gal
(19 liters) Diesel engine Of which
reser ve
fuel
Models with appr ox.
20 gal (93 l) total
capacity appr
ox. 5 gal
(19 liters) DEF
Note
s on DEF
Obser vethe no tes on operating fluids
(/ page 263).
DEF is a water-soluble fluid forth eex haust gas
af te rtre atment of diesel engines.
* NO
TEDama gecaused byadditives in
DEF or bydiluting DEF The DEF
exhaust gas af tertre atment sy stem
could be destr oyed bythefo llowing:
R Additives in DEF
R Diluting DEF #
Only use DEF in accordance with ISO
222 41 . #
Do not mix additives. #
Do not dilu teDEF. *
NO
TEDama geand malfunctions caused
by impurities in DEF Impurities in DEF
result in thefo llowing:
R Higher emission values
R Damage tothe catalytic con verter
R Engine damage
R Malfunctions in the DEF exhaust gas
af te rtre atment sy stem #
Avoid impurities in DEF. +
ENVIRONMENTAL
NOTESoiling wi th
DEF DEF
residue cr ystallizes af ter some time and
st ain the af fected sur faces. 266
Tech nical da ta
cases, oil of
the type in the engine is not availa‐
ble, use ano ther appr oved mineral or synthetic
engine oil.
Ve hicles with a diesel engine: ifth e grade is
not available, you may also refill with engine oils
acco rding toMB-F reigabe or MB-Appr oval 228.5,
229.3 or 229.5. The top-up quantity is then limi‐
te dto maximum 1.1 US qt (1.0 liter).
Yo u must then ha vean oil change car ried out at
th e earliest possible opportunit y.
Ve hicles with a gasoline engine: ifth e grade is
not available, you may refill with engine oils
acco rding toMB-F reigabe or MB-Appr oval 229.3
or AC EA A3/B4. The top-up quantity is then limi‐
te dto maximum 1.1 US qt (1.0 liter).
Yo u must then ha vean oil change car ried out at
th e earliest possible opportunit y.
Engine oils are di stinguished by:
R engine oil brand
R grade (MB-F reigabe or MB-Appr oval)
R SAE classi fication (viscosity)
Oil change inter val
The on-board computer automatically sho wsthe
date of the next oil change as an event messa ge
on the displa y.
Mercedes-Benz recommends having the oil
ch anged at a qualified specialist workshop.
Engine oil capacities Engine
Engine oil
M2 74 around11.2 qt
(10.5 li ters)
OM642 around13.2 qt
(12.5 li ters)
OM651 (rear wheel
drive) around
12qt
(1 1. 5 liters) Information on oil consum
ption
Depending on the driving style, theve hicle con‐
sumes a maximum of 1.1 US qt (1.0 liter) of
engine oil per 620 miles (1000 km).
In thefo llowing cases, oil consum ption may also
exc eed this limit:
R theve hicle is ne w.
R you use theve hicle mostly under arduous
conditions.
R you drive frequently at a high engine speed. Re
gular maintenance is a prerequisite forfa vo ra‐
ble consum ption figures. You can on lyassess the
oil consum ption af ter a long journe y.Check the
oil le vel in the engine regularly, e.g. weekly or
ev ery time youre fuel. Note
s on brake fluid Obser
vethe no tes on operating fluids
(/ page 263). &
WARNING Risk of an accident due to
va por poc kets form ing in the brake sys‐
tem
The brake fluid con stantly absorbs moisture
from the air. This lo wersthe boiling point of
th e brake fluid. If the boiling point is too lo w,
va por poc kets may form inthe brake sy stem
when the brakes are applied hard.
This causes the braking ef fect to be impaired. #
Have the brake fluid rene we d at the
specified inter vals. *
NO
TEDama getopaint, plastic or rubber
by brake fluid There is a
risk of damage toproperty if brake
fl uid comes into con tact wi thpaint, plastic or
ru bber. #
If paint, plastic or rubber comes into
con tact wi thbrake fluid, rinse wi th
wate r immediatel y. Obser
vethe no tes on paintwork/matte finish
paintwork care (/ page 211).
Ha ve the brake fluid replaced regular lyat a quali‐
fi ed specialist workshop.
Only use brake fluid appr ovedby Mercedes-Benz
in accordance with MB-F reigabe or MB-Appr oval
33 1.0.
Fu rther information on brake fluid:
R inthe MB Specifications for operating fluids
at http://be vo.mercedes-benz.com
R at a qualified specialist workshop Coolant
Note
s on coolant
Obser vethe no tes on operating fluids
(/ page 263). Te
ch nical da ta269
