Mercedes-Benz C-Class-Saloon 2020 Owner's Manual page 436

The recommended octane number for your vehi‐
cle can also be found on the information label in
the fuel filler flap ( page 172).
/
As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded petrol with at least:
C 180: 93 RON
R
All other models: 91 RON
R
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
Observe the notes on operating fluids
( page 430).
/
* NOTE Damage from use of unsuitable
additives
Even small amounts of the wrong additive
may lead to malfunctions occurring.
Only add cleaning additives recommen‐
#
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 430).
/
& 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.
Internal use only
Technical data 433
Never refuel using petrol in diesel
#
engines.
Never mix petrol with diesel fuel.
#
* 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
#
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.
Vehicles without diesel particulate
#
filter: refuel using only diesel fuel with
a sulphur content less than 500 ppm.
Never refuel with one of the following fuels:
petrol
R