Engine compartment
Bonnet
 | Risk of accident |
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Do not pull the release lever while the vehicle is in motion. If you do so, the bonnet may open up 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 automatically, even if the key has been removed from the ignition lock. For this reason you must not reach into the turning area of the fan. You can otherwise be injured.
Vehicles with a petrol engine:The electronic ignition system uses high voltage. For this reason, you must never touch components of the ignition system (ignition coil, ignition cable, spark plug connector or test socket) when:
Vehicles with a diesel engine:The electronic injection control uses high voltage. Therefore, never touch fuel injection system components when:
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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 release lever .
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The bonnet is released.
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Make sure that the windscreen wipers are not folded out away from the windscreen. You can 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).
Using the oil dipstick
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| Oil dipstick |
| Maximum mark |
 | Minimum mark |
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Illustration: vehicle with a petrol engine (CLK 350)
Topping up the engine oil
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| Cover |
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Illustration: vehicle with a petrol engine (CLK 350)
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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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| Cover |
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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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