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362 Maintenance and care
Frequent operation in mountainous terrain or
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on poor road surfaces
When the engine is often left 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 filter, air filter, engine oil and oil filter,
for example, changed more frequently. Check the
tyres more frequently if the vehicle is operated
under increased stress. Further information can
be obtained at a qualified specialist workshop.
Battery disconnection periods
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 361).
/
Engine compartment
Opening and closing the bonnet
& WARNING 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.
& WARNING 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.
& WARNING Risk of burns when opening the
bonnet
If you open the bonnet in the event of an over-
heated engine or fire 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 fluids.
Before opening the bonnet, allow the
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engine to cool down.
In the event of a fire in the engine com-
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partment, keep the bonnet closed and
call the fire service.
& WARNING Risk of injury due to moving
parts
Components in the engine compartment can
continue to run or start unexpectedly even
when the ignition is switched off.
Observe the following before performing tasks
in the engine compartment:
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