Diesel Exhaust Fluid (Def) - Mercedes-Benz Sprinter Operator's Manual

! Do not use fuel additives (with the
exception of flow improvers), since this
could lead to malfunctions or engine
damage. Damage caused by the use of
such additives is not covered by the New
Vehicle Limited Warranty.
! Do not add gasoline or kerosene to diesel
fuel to improve its flow characteristics.
Gasoline or kerosene impairs the
lubricating properties of the diesel fuel.
This may cause damage to the injection
system, for example.
At outside temperatures below
14 ‡(–10 †) and with less cold-resistant
winter diesel fuel, add the amount of flow
improver appropriate to the outside
temperature.
Add this additive to the diesel in time, i.e.
before the flow properties of the diesel are
affected by paraffin separation. Malfunctions
caused by paraffin separation can only be
rectified by heating the entire fuel system,
e.g. by parking the vehicle in a heated garage.
G
Warning
If you heat up the fuel system with a heat gun,
for example, you may damage parts of the fuel
system. Fuel could escape, be ignited, and
cause a fire.
Never heat the fuel system with a heat gun or
with a naked flame.

Diesel Exhaust Fluid (DEF)

DEF is the reducing agent for the exhaust gas
aftertreatment. DEF is a nonflammable,
nontoxic, colorless, odorless and water-
soluble liquid.
! Only use DEF in accordance with
ISO 22241. The exhaust gas aftertreatment
may otherwise be damaged.
Observe the MB Specifications for Service
Products, Sheet No. 352.0.
Damage caused by the use of other
reducing agents will result in the loss of
Service products
your New Vehicle Limited Warranty
entitlements.
! If DEF comes into contact with a painted
or aluminum surface, wash the surface off
immediately with plenty of water.
High ambient temperatures
If DEF in the DEF reservoir heats up to
temperatures over 122 ‡(50 †) for a long
period of time (e.g. due to direct sunlight),
ammonia vapors form.
G
Warning
If you open the DEF reservoir cap at high
temperatures, ammonia vapors could be
released.
Ammonia vapors have a pungent odor and are
particularly irritating for your skin, respiratory
organs and eyes. This may result in burning
eyes, nose and throat, as well as coughing and
watering eyes.
Do not inhale ammonia vapors.
Low ambient temperatures
DEF freezes at a temperature of
approximately 12 ‡(–11 †). The vehicle is
equipped with a DEF preheating system at the
factory. This ensures that the vehicle can be
operated in winter, even at temperatures
below 12 ‡(–11 †).
Additives and tap water
! Do not mix DEF with any additives and do
not dilute DEF with tap water. Otherwise,
the exhaust gas aftertreatment may be
damaged.
Observe the MB Specifications for Service
Products, Sheet No. 352.0.
Damage caused by the use of additives or
tap water is not covered by the New Vehicle
Limited Warranty.
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