Mercedes-Benz CLS Operator's Manual page 367

364 Technical data
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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The following compatibility indications for fuel
apply to your vehicle:
1 For petrol with a maximum of 5% ethanol by
volume
2 For petrol with a maximum of 10% ethanol by
volume
According to European standard EN 16942, you
can find the compatibility indications in the follow-
ing locations:
On the vehicle, on the information label on the
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fuel filler flap ( page 171)
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On the fuel dispenser or pump nozzle suitable
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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 for your vehi-
cle can also be found on the information label on
the fuel filler flap ( page 171).
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Vehicles with M256 petrol engine: if you are
using 95 RON, there may be slight limitations
in performance that have no further conse-
quences.
Refuel only with super unleaded petrol with an
octane number of at least 98 RON if you wish to
achieve maximum engine output. Alternatively,
you can also refuel using premium-grade unlea-
ded petrol with an octane number of at least
95 RON.
As a temporary measure, if the recommended fuel
is not available, you may also use regular unlea-
ded petrol with an octane number of at least
91 RON. This may reduce engine output and
increase fuel consumption.
Never refuel using petrol of 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 362).
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* 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.