B-Class - Interactive Owner's Manual
Keywords
Introduction
At a glance
Safety
Controls
Operation
The first 1,500 km
Refuelling
Engine compartment
Tyres and wheels
Winter driving
Driving tips
Driving abroad
Trailer towing*
Service
Care
Practical advice
Technical data

Engine compartment

Quick Access

Bonnet
Engine oil
Coolant
Windscreen washer system/headlamp cleaning system*

Bonnet

Risk of accident

Do not pull the release lever while the vehicle is in motion. The bonnet could otherwise open.

Opening

Risk of injury

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.
Risk of injury

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 could otherwise sustain an injury.

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:

  • the engine is running

  • the engine is being started

  • the ignition is switched on and the engine is being cranked by hand

Vehicles with a diesel engine:

The electronic injection control uses high voltage. Therefore, never touch fuel injection system components when:

  • the engine is running

  • the engine is being started

  • the ignition is switched on
  

Make sure that the windscreen wipers are switched off.
Risk of injury

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 linkage.

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.
Bonnet release lever
  

Pull release lever .
 

The bonnet is released.

Make sure that the windscreen wipers are not folded away from the windscreen. You could otherwise damage the windscreen wipers or the bonnet.
Bonnet catch handle
  

Pull handle of the bonnet catch outwards from the radiator grille and lift the bonnet from underneath by the radiator grille.
Recess
Support strut
Retainer
  

Pull support strut out of retainer .
  

Swing support strut upwards and insert it into yellow recess .

Closing

Risk of injury

Make sure that nobody can become trapped as you close the bonnet.
  

Raise the bonnet slightly and remove support strut from yellow recess .
  

Swing support strut down and press it into retainer until it engages.
  

Lower the bonnet and let it fall from a height of approximately 20 cm.
  

Check that the bonnet has engaged properly.

If the bonnet can be raised slightly, it is not properly engaged. Open it again and close it with a little more force.
 

Engine oil

Depending on how it is driven, 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:

  • the vehicle should be parked on level ground.

  • the engine should be switched off for at least five minutes if the engine was at normal operating temperature.

  • 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*

Only possible on vehicles with a diesel engine. A dipstick is used to check petrol engines more.
  

Make sure that the key is in position 2 in the ignition lock more.
  

Press the or button to select the following message:

The measurement takes a few seconds. You will see one of the following messages in the display:

  • Engine oil level OK

  • Add 1.0 litre to reach maximum oil level

  • Add 1.5 litres to reach maximum oil level

  • Add 2.0 litres to reach maximum oil level

  

Top up the oil if necessary more.
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

  

Have excess oil siphoned off.

There is a risk of damage to the engine or the catalytic converter if there is excess oil in the engine.

If the Switch ignition on to check engine oil level message appears:

  

Turn the key to position 2 in the ignition lock more.

You will see the following message if you did not observe the required waiting time: Observe waiting period

  

Repeat the measurement after about five minutes if the engine is at normal operating temperature.
  

Repeat the measurement after about 30 minutes if the engine is not at normal operating temperature (if the engine was only started briefly).

The following message appears if the engine is running:

Engine oil level Not with engine running

  

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.

If you wish to cancel the measurement, press the or button on the multi-function steering wheel.
Using the oil dipstick
Oil dipstick
Maximum mark
Minimum mark

Illustration: vehicle with a petrol engine (B 200)

Oil dipstick
Maximum mark
Minimum mark

Illustration: vehicle with a diesel engine (B 180 CDI)

  

Pull oil dipstick out of the oil dipstick tube.
  

Wipe off oil dipstick .
  

Insert oil dipstick into the oil dipstick tube to the stop, and take it out again.
 

The oil level is correct if the level is between minimum mark and maximum mark .
  

Top up the oil if necessary.

The difference in quantity between minimum mark and maximum mark is approximately 1.5 litres.

Topping up the engine oil

Cover

Illustration: vehicle with a petrol engine (B 200)

Cover

Illustration: vehicle with a diesel engine (B 180 CDI)

  

Unscrew cap and remove it.
  

Top up by the amount of oil required.

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.
  

Screw cap onto the filler neck.
Environmental note

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.
 

Coolant

Risk of injury

The cooling system is pressurised. Therefore, only unscrew the cap once the engine has cooled down. The coolant temperature gauge must display less than 70 °C. You could otherwise be scalded by escaping hot coolant.

Coolant consists of water and antifreeze/corrosion inhibitor. Only check the coolant level when the vehicle is on a level surface and the engine has cooled down.

Checking the coolant level

Cover
Expansion tank
Marker bar
  

Slowly turn cap by half a turn anti-clockwise to allow excess pressure to escape.
  

Turn cap further anti-clockwise and remove it.
 

There is sufficient coolant in expansion tank if the coolant is level with the marker bar in the filler neck when cold or approximately 1.5 cm higher when hot.
  

Top up the coolant if necessary.
  

Replace cap and tighten all the way to the stop.

You will find further information about coolant in the "Technical data" section more.

 

Windscreen washer system/headlamp cleaning system*

Cover
  

Add windscreen washer concentrate to the washer fluid all year round.
Risk of fire

Windscreen washer concentrate is highly flammable. Fire, naked flames and smoking are prohibited when windscreen washer concentrate is being handled.

    Use

  • a windscreen washer fluid additive such as MB Summerwash to prevent smearing (for temperatures above freezing).

  • a windscreen washer fluid additive with antifreeze properties such as MB Winterwash (if there is a risk of frost).

  

Mix the windscreen washer fluid in a container beforehand. Adapt the mixing ratio to the outside temperatures.

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.
  

To open: pull cap upwards by the tab.
  

To close: press cap onto the filler neck until it clicks into place.