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  • V-Class
  • 03/2021
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Topping up the engine oil
WARNING Risk of burns when opening the bonnet
If you open the bonnet when the engine has overheated or when there is a fire in the engine compartment, the following situations may occur:

  • You could come into contact with hot gases.

  • You could come into contact with other hot, escaping operating fluids.

Before opening the bonnet, allow the engine to cool down.
In the event of a fire in the engine compartment, keep the bonnet closed and call the fire service.
WARNING 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 off.

Make sure of the following before performing tasks in the engine compartment:

Switch the ignition off.
Never reach into the danger zone surrounding moving components, e.g. the rotation area of the fan.
Remove jewellery and watches.
Keep items of clothing and hair away from moving parts.
WARNING Risk of fire and injury from engine oil

If engine oil comes into contact with hot component parts in the engine compartment, it may ignite.

Make sure that no engine oil is spilled next to the filler opening.
Allow the engine to cool off and thoroughly clean the engine oil from component parts before starting the vehicle.
WARNING Risk of burns from hot component parts in the engine compartment

Certain component parts in the engine compartment can be very hot, e.g. the engine, the cooler and parts of the exhaust system.

Allow the engine to cool down and only touch component parts described in the following.
NOTE Damage caused by topping up too much engine oil

Too much engine oil can damage the engine or the catalytic converter.

Have excess engine oil removed at a qualified specialist workshop.
NOTE Engine damage due to use of additives in the engine oil

The use of additional additives in the engine oil can damage the engine.

Do not use any additional additives in the engine oil.
ENVIRONMENTAL NOTE Environmental damage due to hydraulic fluid level spillages while topping up

If fluid spills onto soil, the environment will be damaged.

Make sure that no fluid spills while topping up.
Example: engine oil filler opening
Observe the information regarding approved engine oil under "Operating fluids and capacities" More.
Unscrew and remove the cap .
Top up engine oil.
Fit the cap on the filler opening and tighten.

When doing so, make sure that the cap engages correctly.

If present, check the oil level using the oil dipstick More.
In the case of vehicles without an oil dipstick, check the oil level with the on-board computer after the next journey More.

It is necessary to run the engine for an extended period after each oil top up to correctly detect the oil level. Fill level changes during oil top ups may not be immediately visible. Depending on the driving profile, the new oil level can only be displayed after a driving time of up to 60 minutes.

If necessary, only top up the quantity of oil shown in the instrument cluster display and check the oil level again after the next journey.

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