Mercedes-Benz GLS Owner's Manual page 224

®
Opening the AdBlue filler cap
Press on the back area of fuel filler flap 1.
#
Turn AdBlue ® filler cap 2
#
remove it.
®
Topping up AdBlue
Mercedes-Benz recommends topping up
AdBlue ® at a filling pump. If no AdBlue
pump is available, you can also top up AdBlue
using a canister.
Screw on the fastener of AdBlue
#
ter 4.
Screw disposable hose
#
of AdBlue
Screw disposable hose
#
neck of the vehicle until hand-tight.
anti-clockwise and
Lift up and tip AdBlue
#
The filling process stops when the AdBlue
tank is completely full.
® filling
® refill canis‐
3 onto the opening
® refill canister 4 until hand-tight.
3 onto the filler
®
refill canister 4.
® ®
AdBlue refill canister
when it has been only partially emptied.
Unscrew and close disposable hose
#
AdBlue ® refill canister
®
Replace AdBlue filler cap
#
clockwise until it audibly engages.
Close fuel filler flap 1.
#
Switch on the ignition for at least 60 sec‐
#
onds.
% If the engine could not be started due to the
®
AdBlue tank being empty, it can take up to
60 seconds for the top up to be detected.
Start the vehicle.
#
%
Avoid storing AdBlue
manently in the vehicle.
®
Driving and parking 221
4 can be removed
3 and
4 in reverse order.
2 and turn it
® refill containers per‐