Mercedes-Benz GL Operator's Manual page 189

water. Seek medical assistance without
delay.
Change out of clothing contaminated with
R
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
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.
! Rinse surfaces that have come into
contact with DEF immediately with water or
remove DEF using a damp cloth and cold
water. If the DEF has already crystallized,
use a sponge and cold water to clean it. DEF
residues crystallize after time and
contaminate the affected surfaces.
! 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 448).
Y
You will find further information on DEF in the
printed Operator's Manual under "Technical
data".
Opening the DEF filler cap
The fuel filler flap is unlocked or locked
automatically when you open or close the
vehicle with the SmartKey or with KEYLESS-
GO.
Switch the ignition off.
X
Press the fuel filler flap in the direction of
X
arrow :.
The fuel filler flap swings up.
Turn blue DEF filler cap ; counter-
X
clockwise and remove it.
DEF filler cap ; is secured with a plastic
strip.
DEF refill bottle
! Only screw on the DEF refill bottle hand-
tight. It could otherwise be damaged.
Unscrew the protective cap from DEF refill
X
bottle :.
Place DEF refill bottle : on the filler neck
X
as shown and screw it on clockwise until
hand-tight.
Refueling
187
Z