Mercedes-Benz A-Class 2021 Operator's Manual page 257

Turn cap 1 counter-clockwise and remove
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it.
Add engine oil.
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Replace cap 1 and turn it clockwise until it
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engages.
Check the oil level again ( page 253).
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Checking the coolant level
& WARNING Risk of burns from hot com‐
ponent parts in the engine compartment
Certain component parts in the engine com‐
partment can be very hot, e.g. the engine,
the cooler and parts of the exhaust system.
Allow the engine to cool down and only
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touch component parts described in
the following.
& WARNING Risk of scalding from hot
coolant
If you open the cap, you could be scalded.
Let the motor cool down before opening
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the cap.
When opening the cap, wear protective
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gloves and safety glasses.
Open the cap slowly to release pres‐
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sure.
Maintenance and care 255
Park the vehicle on a level surface.
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Check the coolant temperature display in the
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instrument cluster.
The coolant temperature must be in the bot‐
tom quarter of the temperature display.
Slowly turn cap 1 counter-clockwise to
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release overpressure.