Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 452

If you have accidentally refuelled with the
wrong fuel:
Do not switch on the vehicle.
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Consult a qualified specialist workshop.
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Compatibility indications for fuel:
1
For petrol with a maximum of 5% ethanol by
volume
2 For petrol with a maximum of 10% ethanol by
volume
The compatibility indications for fuel on the vehi-
cle according to European standard EN 16942
can be found on the information label on the fuel
filler flap or on the fuel dispenser or pump nozzle
suitable for your vehicle throughout Europe.
If the available fuel is not sufficiently low in sul-
phur, it may produce unpleasant odours.
The recommended octane number can be found
on the information label on the fuel filler flap
( page 195).
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If the recommended fuel is not available, you may
also temporarily use regular unleaded petrol with
an octane number of at least 91 RON.
This may reduce engine output and increase fuel
consumption.
Never refuel using petrol with an even lower RON.
Further information on fuel can be obtained at a
filling station or a qualified specialist workshop.
▌Information on additives in petrol (vehicles with
petrol engine)
Observe the notes on operating fluids
( page 447).
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Technical data 449
* NOTE Damage from use of unsuitable
additives
Even small amounts of the wrong additive may
lead to malfunctions occurring.
Only add cleaning additives recommen-
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ded by Mercedes-Benz to the fuel.
Mercedes-Benz recommends that you use brand-
name fuels with additives.
In some countries, the fuel available may not have
sufficient additives. Deposits could build up in the
fuel injection system as a result. In this case, in
consultation with a qualified specialist workshop
(e.g. a Mercedes-Benz service centre), mix the
fuel with the cleaning additive recommended by
Mercedes-Benz. Observe the notes and mixing
ratios indicated on the tank.
▌Information on fuel quality for vehicles with a
diesel engine
General notes
Observe the notes on operating fluids
( page 447).
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