Mercedes-Benz GLS Operator's Manual page 161

When the DEF supply drops to a minimum, the
Remaining Starts: 16
the multifunction display.
If the Remaining Starts: 16
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.
Add at least 2 gal (7.5 l) of DEF.
X
Switch on the ignition for at least 60 seconds.
X
Start the engine.
X
i
Have the DEF tank refilled at a qualified spe-
cialist workshop.
Use the special DEF refill bottle when adding
DEF between maintenance intervals. You can
obtain further information from an authorized
Mercedes-Benz Center or, if necessary, contact
Roadside Assistance (
Y
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
DEF is a water-soluble fluid for the exhaust gas
aftertreatment of diesel engines. It is:
not poisonous
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colorless and odorless
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not flammable
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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 experi-
ence a burning sensation in your eyes, 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 must not be swallowed.
Keep DEF away from children.
message is shown in
message
page 29).
If you or other persons come into contact with
DEF, observe the following:
Rinse DEF from your skin immediately with
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soap and water.
If DEF comes into contact with your eyes,
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immediately rinse them thoroughly with clean
water. Seek medical assistance without
delay.
If DEF has been swallowed, rinse your mouth
R
out immediately. Drink plenty of water. Seek
medical assistance without delay.
Change out of clothing contaminated with
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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 after-
treatment 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 is not permitted if the vehicle
is not parked on a level surface. There is a
danger of overfilling, which could result in
damage to components of the BlueTEC
exhaust gas aftertreatment.
!
Immediately rinse off surfaces which come
into contact with DEF or remove DEF with a
damp cloth and cold water. If DEF has already
crystallized, clean using a sponge and cold
water. DEF residue crystallizes after a short
period and contaminates the affected surfa-
ces. Furthermore, electrical components in
the vicinity may be damaged by DEF.
!
DEF is not a fuel additive and must not be
added to the fuel tank. If DEF is added to the
fuel tank, this can lead to engine damage.
For further information on DEF, see
( page 389).
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Refueling
159
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