Mercedes-Benz A-Class 2021 Operator's Manual page 327

Change immediately out of clothing that
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has come into contact with fuel.
Fuel
Notes on fuel grades for vehicles with a gas‐
oline engine
Observe the notes on operating fluids
( page 323).
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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 with low-sulfur gasoline.
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This fuel may contain up to 10% ethanol by
volume. Your vehicle is suitable for use with
E10 fuel.
Never refuel with one of the following fuels:
Diesel
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Gasoline with more than 10% ethanol by
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volume, e.g. E15, E85, E100
Gasoline with more than 3% methanol by
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volume, e.g. M15, M30, M85, M100
Gasoline with additives containing metal
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If you have accidentally refueled with the
wrong fuel:
Do not switch the ignition on.
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Consult a qualified specialist workshop.
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If the available fuel is not sufficiently low in sul‐
fur, this can produce unpleasant odors.
Only refuel with fuel that has at least the octane
number specified in the information label in the
fuel filler flap ( page 142).
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If you want maximum engine output: only
refuel with unleaded premium grade gasoline
with an octane number of at least 91 AKI/
95 RON.
As a temporary measure, if the recommended
fuel is not available, you may also refuel with
unleaded regular gasoline with at least 87 AKI/
Technical data 325
91 RON. This may reduce engine output and
increase fuel consumption.
Never refuel using gasoline with an even lower
RON.
* NOTE Premature engine wear through
unleaded regular gasoline
Impairment of the longevity and performance
of the engine.
If unleaded premium grade gasoline is
unavailable and you have to refuel using
unleaded regular gasoline:
Only fill the fuel tank to half full with
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unleaded regular gasoline and refill as
soon as possible with unleaded pre‐
mium grade gasoline.
Do not drive at the maximum design
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speed.
Avoid sudden acceleration and engine
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speeds over 3000 rpm.