Mercedes-Benz S-Class 2020 Owner's Manual page 225

222 Driving and parking
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Opening the AdBlue filler cap
Press on the back area of fuel filler flap 1.
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Turn AdBlue filler cap 2 anti-clockwise and
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remove it.
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You can also store the AdBlue
the fuel filler cap holder in the fuel filler flap
hinge arm.
Top up AdBlue
Mercedes-Benz recommends topping up
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AdBlue at a filling pump. If no AdBlue
pump is available, you can also top up AdBlue
using a canister.
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filler cap in
Screw on the fastener of AdBlue
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ter 4.
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filling
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refill canis‐
Screw disposable hose 3
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of AdBlue refill canister 4
Screw disposable hose 3
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neck of the vehicle until hand-tight.
Lift up and tip AdBlue ® refill canister 4.
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The filling process stops when the AdBlue
tank is completely full.
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AdBlue refill canister 4 can be removed
when it has been only partially emptied.
Unscrew and close disposable hose
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AdBlue ® refill canister 4 in reverse order.
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Replace AdBlue filler cap 2
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clockwise until it audibly engages.
Close fuel filler flap 1.
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Switch on the ignition for at least 60 sec‐
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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.
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onto the opening
until hand-tight.
onto the filler
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3 and
and turn it