DEF (BlueTEC vehicles only)
Important notes on use
To function properly, BlueTEC exhaustgas
aftertreatment must be operated with the
reducing agent DEF.
When the supply of DEFis almost used up,
the Check Additive See Operator's
Manual message is shown in the
multifunction display.
When the DEF supply drops to a minimum, the
Remaining Starts: 16 message is shown
in the multifunction display.
If the Remaining Starts: 16
message
appears in the multifunction display, you can
start the engine another 16 times. If DEF is
not refilled, you will subsequently be unable
to start the engine. Fill the DEF tank with
approximately 1gal (3.8l) DEF. Have the DEF
tankrefilled at a qualified specialist
workshop.
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If you drive the vehicle faster than
10 mph (16 km/h), the Check Additive
See Operator's Manual message goes
out after approximately one minute.
If the outside temperature is below 12 ‡
(Ò11 †) it may be difficult to top up. If DEF is
frozen and there is an active warning
indicator, it may not be possible to add DEF.
Park the vehicle in a warmer place, e.g. in a
garage, until DEF has become fluid again. It
will then be possible to add DEF again.
Alternatively, have the DEF tank refilled at a
qualified specialist workshop.
Further information about BlueTEC exhaust
gas aftertreatment and DEF is available at any
authorized Mercedes-Benz Center.
Important safety notes on the refilling
procedure
DEF is a water-soluble fluid for the exhaust
gas aftertreatment of diesel engines. It is:
R
not poisonous
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colorless and odorless
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not flammable
When you open the DEF container, small
amounts of ammonia vapor may be released.
Ammonia vapors have a pungent odor and are
particularly irritating to the skin, to mucous
membranes and to the eyes. You may
experience a burning sensation in youreyes,
nose and throat. Coughing and watering of
the eyes are possible.
Do not inhale ammonia vapors. Fill the DEF
tank only in well-ventilated areas.
DEF must not come into contact with your
skin, eyes or clothing and mustnot be
swallowed. Keep DEFaway fromchildren.
If you or other persons come into contact with
DEF, observe the following:
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Rinse DEF from your skin immediately with
soap and water.
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If DEF comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance
without delay.
R
If DEF has been swallowed, rinse your
mouth out immediately. Drink plenty of
water. Seek medical assistance without
delay.
R
Change out of clothing contaminated with
DEF immediately.
!
Only use DEF in accordance with
ISO 22241. Do not mix any additives with
DEF, and do not dilute DEF with water. This
may destroy the BlueTEC exhaust gas
aftertreatment system.
!
The vehicle must be parked on level
ground to fill the DEF tank. The DEF tank
can only be filled as intended with the
vehicle parked on a level surface. This
avoids false level readings. Filling the tank
Refueling
177
Driving and parking
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