Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class Owners Manual: Engine oil

Checking the engine oil level using the oil dipstick

WARNING Risk of burns from hot component parts in the engine compartment
Certain components in the engine compartment can be very hot, e.g. the engine, the radiator and parts of the exhaust system.
  • Allow the engine to cool down and only touch component parts described in the following.

Requirements:

  • The engine must have an oil dipstick. If not, the engine oil level can be checked only with the on-board computer.

Depending on the engine, the oil dipstick may be installed in the engine compartment in different locations.

The waiting time before checking the oil level when the engine is at normal operating temperature is five minutes.

Engine compartment

  • Park the vehicle on a level surface.
  • Pull oil dipstick 1 out and wipe off.
  • Slowly slide oil dipstick 1 into the guide tube to the stop, and take it out again after approximately three seconds.
    • Oil level is correct: oil level is between 2 and 3.
    • Oil level too low: oil level is at 3 or below.
    • Oil level too high: oil level is above 2.
  • If the oil level is too low, add 1.1 US qt (1 liter) of engine oil.
  • If the oil level is too high, drain off excess engine oil. Consult a qualified specialist workshop.

Checking the engine oil level using the onboard computer

Requirements

The engine must have an oil level sensor. If not, the engine oil level can be checked only with the oil dipstick.

The engine oil level is determined during driving.

Determining the engine oil level can take up to 30 minutes with a normal driving style and even longer with an active driving style.

In order to receive a result as quickly as possible:

  • Warm up the engine
  • Park the vehicle on a level surface
  • Leave the engine running at idling speed

On-board computer:  Service → Engine Oil Level

You will see one of the following messages on the multifunction display:

  • Measuring Engine Oil Level...: measurement of the oil level is not yet possible.
  • Repeat the request after a maximum of 30 minutes driving.
  • Engine Oil Level OK and the bar display for indicating the oil level on the multifunction display is green and is between "min" and "max": the oil level is correct.
  • Engine Oil Level Add 1.0 l and the bar display for indicating the oil level on the multifunction display is orange and is below "min":
  • Add 1.1 US qt (1 l) engine oil.
  • Reduce Engine Oil Level and the bar display for indicating the oil level on the multifunction display is orange and is above "max":
  • Drain off excess engine oil that has been added. Consult a qualified specialist workshop.
  • For Engine Oil Level Switch Ignition On:
  • Switch on the ignition to check the engine oil level.
  • Engine Oil Level System Inoperative: sensor faulty or not inserted.
  • Consult a qualified specialist workshop.
  • Engine Oil Level System Currently Unavail.:
  • Close the hood.

Adding engine oil

WARNING Risk of burns from hot component parts in the engine compartment
Certain components in the engine compartment can be very hot, e.g. the engine, the radiator and parts of the exhaust system.
  • Allow the engine to cool down and only touch component parts described in the following.

 

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.

 

NOTE Engine damage caused by an incorrect oil filter, incorrect oil or additives
  • Do not use engine oils or oil filters which do not correspond to the specifications explicitly prescribed for the service intervals.
  • Do not alter the engine oil or oil filter in order to achieve longer change intervals than prescribed.
  • Do not use additives.
  • Follow the instructions in the service interval display regarding the oil change.

 

NOTE Damage caused by adding 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.

Engine compartment

  • Turn cap 1 counter-clockwise and remove it.
  • Add engine oil.
  • Replace cap 1 and turn it clockwise as far as it will go.
  • Check the oil level again.
    Opening/closing the hood

    Checking coolant level

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