Mercedes-Benz CLS Owner's Manual page 353

350 Technical data
The recommended octane number for your vehi‐
cle can also be found on the instruction label in
the fuel filler flap ( page 166).
/
Only refuel with super unleaded petrol with an
octane number of at least 98 RON if you want
maximum engine output. Alternatively, you can
also refuel using premium-grade unleaded petrol
with at least 95 RON.
As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded petrol with at least 91 RON. This may
reduce engine output and increase fuel con‐
sumption.
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
Observe the notes on operating fluids
( page 347).
/
* 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. Residue could build up
in the fuel injection system as a result. In this
case, in consultation with 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 grades for vehicles with
a diesel engine
General notes
Observe the notes on operating fluids
( page 347).
/
& WARNING Risk of fire from fuel mixture
If you mix diesel fuel with petrol, the flash
point of the fuel mixture is lower than that of
pure diesel fuel.
Never refuel using petrol in diesel
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engines.
Never mix petrol with diesel fuel.
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* NOTE Damage caused by the wrong fuel
Even small amounts of the wrong fuel could
result in damage to the fuel system, the
engine and the emission control system.
Only refuel using sulphur-free diesel
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fuel that conforms to European stand‐
ard EN 590, or an equivalent specifica‐
tion.
In countries without sulphur-free diesel
fuel, refuel using only low-sulphur diesel
fuel with a sulphur content less than
50 ppm.