Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 502

500 Technical data
1 For petrol with maximum 5% ethanol by vol-
ume
2 For petrol with maximum 10% ethanol by vol-
ume
If the available fuel is not sufficiently low in sul-
phur, this can produce unpleasant odours.
Recommended fuel: the recommended octane
number for your vehicle can be found in the infor-
mation label in the fuel filler flap (
All models: if you wish to achieve maximum
engine output, refuel using only super unleaded
petrol with at least 98 RON. Alternatively, you can
also refuel using premium-grade petrol with at
least 95 RON.
All models: as a temporary measure, if the recom-
mended fuel is not available, you may also 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 a 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 498).
/
* NOTE Damage from use of unsuitable
additives
Even small amounts of the wrong additive may
lead to malfunctions occurring.
Only add cleaning additives recommen-
#
page 207).
/
ded by Mercedes-Benz to the fuel.
Mercedes-Benz recommends that you use brand-
name fuels with additives.
P223 0288 02
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 Mercedes-Benz service
centre, mix the fuel with the cleaning additive rec-
ommended 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 498).
/
& 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
#
engines.
Never mix petrol with diesel fuel.
#