Mercedes-Benz 2016 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 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 vehi-
cle 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 overfill-
ing, which could result in damage to com-
ponents of the BlueTEC exhaust gas after-
treatment.
! Rinse surfaces that have come into con-
tact 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 contam-
inate 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 dam-
age.
For further information on DEF, see
( page 450).
Y
Opening the DEF filler cap
The fuel filler flap is unlocked or locked auto-
matically 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 fuel filler cap ; counter-
X
clockwise and remove it.
DEF filler cap ; is secured with a plastic
strip.
DEF refill canisters
! Do not tighten the disposable hose with
too much force. The disposable hose may
otherwise be destroyed.
Unscrew the cap from the opening on top of
X
DEF refill canister ;.
Place disposable hose : on the opening of
X
DEF refill canister ; and screw it on clock-
wise until hand-tight.
Refueling
187
Z