AdBlue
®
residue crystallises after a certain
amount of time and soils the affected sur-
faces.
High outside temperatures
If AdBlue
®
is heated to above 50 † for an
extended period of time, AdBlue
®
may start
to decompose, e.g. due to direct sunlight on
the AdBlue
®
tank. Ammonia vapours develop
as a result.
G
WARNING
Ammonia vapours may escape if the
AdBlue
®
tank cap is opened at high tempera-
tures. Ammonia vapours have a pungent
odour and are particularly irritating to the
skin, to mucous membranes and to the eyes.
You may experience a burning sensation in
your eyes, nose and throat, as well as cough-
ing and watering of the eyes.
Do not inhale ammonia vapours.
Low outside temperatures
AdBlue
®
freezes at a temperature of approx-
imately –11 †. The vehicle is equipped with
an AdBlue
®
preheating system at the factory.
Winter operation can thus be guaranteed
even at temperatures below –11 †.
Additives
!
Only use AdBlue
®
in accordance with ISO
22241. Do not use additives with AdBlue
®
and do not dilute AdBlue
®
with water. This
may destroy the BlueTEC exhaust gas after-
treatment system.
Purity
Assuring the purity of AdBlue
®
is particularly
important with respect to avoiding malfunc-
tions in the exhaust gas aftertreatment sys-
tem.
If AdBlue
®
is pumped out of the AdBlue
®
tank,
e.g. during repair work, do not use this fluid
to refill the tank. The purity of the fluid can no
longer be guaranteed.
!
Impurities in AdBlue
®
(e.g. due to other
service products, cleaning agents or dust)
lead to:
R
increased emission values
R
damage to the catalytic converter
R
engine damage
R
®
exhaust
Total capacity of the AdBlue
®
tank
Model
Total
capacity
27.5 l
Engine oil
The quality of engine oils is decisive for the
function and service life of an engine. After
extensive tests, Mercedes-Benz approves
engine oils that correspond to the current
technical standard.
Therefore, only Mercedes-Benz approved
engine oils may be used in Mercedes-Benz
engines.
Further information on tested and approved
engine oils can be obtained from any
Mercedes-Benz Service Centre. Mercedes-
Benz recommends that you have the oil
change carried out at a Mercedes-Benz
Service Centre. Mercedes-Benz approval is
indicated on the oil container by the inscrip-
tion "MB Approval" and the corresponding
designation, e.g. MB Approval 229.51.
The table shows which engine oils have been
approved for your vehicle.
Petrol engines
MB Approval
M 350 4MATIC
229.3, 229.5
Service products and capacities
375
Techn
ical
data
Z
malfunctions in the BlueTEC
gas aftertreatment system
ML 250 BlueTEC 4MATIC
Please bear the following in mind
ML 350 BlueTEC 4MATIC
