Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 211

Consult a qualified specialist workshop.
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* NOTE Do not use diesel to refuel vehicles
with a petrol engine
If you have accidentally refuelled with the
wrong fuel:
do not switch the ignition on. Otherwise
R
fuel can enter the engine.
Even small amounts of the wrong fuel
could result in damage to the fuel system
and the engine. The repair costs are high.
Consult a qualified specialist workshop.
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Have the fuel tank and fuel lines drained
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completely.
* NOTE Do not use petrol to refuel vehicles
with a diesel engine
If you have accidentally refuelled with the
wrong fuel:
do not switch the ignition on. Otherwise,
R
fuel can enter the fuel system.
Even small amounts of the wrong fuel
could result in damage to the fuel system
and the engine. The repair costs are high.
Consult a qualified specialist workshop.
#
Have the fuel tank and fuel lines drained
#
completely.
* NOTE Damage to the fuel system caused
by overfilled fuel tanks
Only fill the fuel tank until the pump noz-
#
zle switches off.
If you have added too much fuel because of a
defective filling pump, for instance:
Do not switch the ignition on.
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P223 0288 02
Driving and parking 209
Consult a qualified specialist workshop.
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* NOTE Fuel may spray out when you
remove the fuel pump nozzle
Only fill the fuel tank until the pump noz-
#
zle switches off.
* NOTE Plug-in hybrid
For vehicles with petrol engines, observe
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the notes in the Supplement. You could
otherwise fail to recognise dangers.
Requirements:
The vehicle is unlocked.
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% Do not get into the vehicle again during the
refuelling process. Otherwise, electrostatic
charge could build up again.
Observe the notes on operating fluids and fuel.
The recommended octane number for your vehi-
cle can be found on the information label in the
fuel filler flap.