Engine compartment
Bonnet
 | Risk of accident |
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Do not pull the release lever while the vehicle is in motion. The bonnet may otherwise open and block your view.
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Opening
| Risk of injury |
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There is a risk of injury if the bonnet is open, even if the engine is not running.
Some engine components can become very hot.
To avoid the risk of burns, only touch those components described in the Operating Instructions and observe the relevant safety notes.
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| Risk of injury |
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The radiator fan between the radiator and the engine can start up by itself even if the key has been removed. Keep away from the area of rotation of the fan blades. Otherwise, you could be injured.
Vehicles with a petrol engine:The electronic ignition system operates with high voltages. For this reason, you must never touch the ignition system components (ignition coil, ignition cables, spark plug connections or test socket) while:
Vehicles with a diesel engine:The electronic injector control operates with high voltages. For this reason, you must never touch injection system components while:
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Make sure that the windscreen wipers are switched off.
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| Risk of injury |
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The windscreen wipers and wiper linkage could be set in motion.
When the bonnet is open, you or others could be injured by the wiper rods.
Make sure that the windscreen wipers are switched off and that the key has been pulled out of the ignition lock before opening the bonnet.
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 | Bonnet release lever |
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Pull bonnet release lever .
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The bonnet is released.
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Make sure that the windscreen wipers are not folded out from the windscreen. You could otherwise damage the windscreen wipers or the bonnet.
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 | Bonnet catch handle |
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Reach into the gap, pull bonnet catch handle up and lift the bonnet.
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Closing
| Risk of injury |
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Make sure that nobody can become trapped as you close the bonnet.
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Lower the bonnet and let it fall from a height of approximately 20 cm.
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Check that the bonnet has engaged properly.
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If the bonnet can be raised slightly, it is not properly engaged. Open it again and close it with a little more force.
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Engine oil
Depending on driving style, the vehicle consumes a maximum of 0.8 l oil per 1,000 km. The oil consumption may be higher than this when the vehicle is new or if you frequently drive at high engine speeds. You can only estimate the oil consumption after you have driven a considerable distance.
You will find further information about engine oil in the "Technical data" section more.
Checking the engine oil level
To do so:
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the vehicle should be parked on level ground.
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the engine should be switched off for at least five minutes if the engine was at normal operating temperature.
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the engine should be switched off for at least 30 minutes if the engine was not at operating temperature (i.e. if you only started the engine briefly).
Via the on-board computer*
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Only possible on the ML 420 CDI. On all other models a dipstick is used to check the engine oil level more.
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The measurement takes a few seconds. You will see one of the following messages in the display:
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Engine oil level OK
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Add 1.0 litre to reach maximum oil level
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Add 1.5 litres to reach maximum oil level
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Add 2.0 litres to reach maximum oil level
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Top up the oil if necessary more.
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Other messages in the multi-function display
If the engine is at normal operating temperature and there is too much oil, you will see the following message:
Eng. oil level
Reduce oil level
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Have excess oil siphoned off.
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There is a risk of damage to the engine or the catalytic converter if there is excess oil in the engine.
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If the Switch ignition on to check engine oil level message appears:
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Turn the key to position 2 more in the ignition lock.
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You will see the following message if you did not observe the required waiting period:
Observe waiting period
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Repeat the measurement after about five minutes if the engine is at normal operating temperature.
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Repeat the measurement after about 30 minutes if the engine is not at normal operating temperature (if the engine was only started briefly).
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The following message appears if the engine is running:
Engine oil level Not when engine on
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Switch off the engine and wait for five minutes if the engine is at normal operating temperature, or for about 30 minutes if the engine is not at normal operating temperature (if the engine was only started briefly), before measuring.
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Using the oil dipstick
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| Oil dipstick |
| Maximum mark |
 | Minimum mark |
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Example: vehicles with a petrol engine
Topping up the engine oil
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| Cap |
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Example: 8-cylinder engine vehicles
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| Cap |
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Example: 6-cylinder engine vehicles
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Unscrew cap and remove it.
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Top up with the amount of oil required.
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Do not add too much oil. If too much oil is added and the oil level is above the maximum mark on the dipstick, the engine or catalytic converter could be damaged. Have excess oil siphoned off.
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Screw cap onto the filler neck.
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 | Environmental note |
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When topping up the oil, take care not to spill any. Oil must not be allowed to escape into the soil or waterways. You would otherwise be damaging the environment.
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Windscreen washer system/headlamp cleaning system*
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| Cap |
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Add windscreen washer concentrate to the washer fluid all year round.
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| Risk of fire |
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Windscreen washer concentrate is highly flammable. Fire, naked flames and smoking are prohibited when windscreen washer concentrate is being handled.
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Use
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a windscreen washer fluid additive such as MB Summerwash to prevent smearing (for temperatures above freezing).
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a windscreen washer fluid additive with antifreeze properties such as MB Winterwash (if there is a risk of frost).
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Mix the windscreen washer fluid in a container beforehand. Adapt the mixing ratio to the outside temperatures.
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Only use windscreen washer fluid which is suitable for plastic lamp lenses. Unsuitable windscreen washer fluid could damage the plastic lamp lenses of the headlamps.
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or 
button to select the following message:
