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358 Maintenance and care
358
Frequent operation in mountainous terrain or
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on poor road surfaces
When the engine is o en le idling for long
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periods
Operation in particularly dusty conditions
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and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, have the
interior air lter, air lter, engine oil and oil lter,
for example, changed more frequently. The tyres
must be checked more frequently if the vehicle is
operated under increased loads. Further informa-
tion can be obtained at a quali ed specialist work-
shop.
Batter ery disconnection per
Batt
y disconnection periods
iods
The ASSYST PLUS service interval display can cal-
culate the service due date only when the battery
is connected.
Display and note down the service due date
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on the instrument display before disconnect-
ing the battery (
page 357).
/
Engine compar
Engine com
partment
tment
Opening and closing the bonnet
Opening and closing t
he bonnet
& W W ARNING
ARNING Risk of accident due to driving
with the bonnet unlocked
The bonnet may open and block your view.
Never release the bonnet when driving.
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Before every trip, ensure that the engine
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bonnet is locked.
& W W ARNING
ARNING Risk of accident and injury
when opening and closing the bonnet
The bonnet may suddenly drop into the end
position.
There is a risk of injury for anyone in the
engine bonnet's range of movement.
Do not open or close the bonnet if there
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is a person in the bonnet's range of
movement.
& W W ARNING
ARNING Risk of burns when opening the
bonnet
If you open the bonnet in the event of an over-
heated engine or re in the engine compart-
ment, the following situations may occur:
You may come into contact with hot gases.
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You may come into contact with other
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escaping hot operating uids.
Before opening the bonnet, allow the
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engine to cool down.
In the event of a re in the engine com-
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partment, keep the bonnet closed and
call the re service.
& W W ARNING
ARNING Risk of injury due to moving
parts
Components in the engine compartment may
continue running or start up suddenly, even if
the ignition is switched o .
Make sure of the following before performing
tasks in the engine compartment:
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