Mercedes-Benz C-Class Manuals

Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: Breaking-in notes

Mercedes-AMG vehicles: observe the notes in the Supplement. Otherwise, you may fail to recognize dangers.

To preserve the engine during the first 1,000 miles (1,500 km):

  • Drive at varying road speeds and engine speeds.
  • Drive the vehicle in drive program or .
  • Change gear before the tachometer needle is 2/3 of the way to the red area of the tachometer.
  • Do not shift down a gear manually in order to brake.
  • Avoid overstraining the vehicle, e.g. driving at full throttle.
  • Vehicles with automatic transmission: Do not depress the accelerator pedal beyond the pressure point (kickdown).
  • Only increase the engine speed gradually and accelerate the vehicle to full speed after 1,000 miles (1,500 km).

This also applies when the engine or parts of the drivetrain have been replaced.

Please also observe the following breaking-in notes:

  • In certain driving and driving safety systems, the sensors adjust automatically while a certain distance is being driven after the vehicle has been delivered or after repairs. Full system effectiveness is not reached until the end of this teach-in process.
  • Brakepads, brake discs and tires that are either new or have been replaced only achieve optimum braking effect and grip after several hundred kilometers of driving. Compensate for the reduced braking effect by applying greater force to the brake pedal.

Notes on driving

WARNING Risk of accident due to objects in the driver's footwell
Objects in the driver's footwell may impede pedal travel or block a depressed pedal.

This jeopardizes the operating and road safety of the vehicle.

  • Stow all objects in the vehicle securely so that they cannot get into the driver's footwell.
  • Always install the floor mats securely and as prescribed in order to ensure that there is always sufficient room for the pedals.
  • Do not use loose floor mats and do not place floor mats on top of one another.


WARNING Risk of accident due to unsuitable footwear
Operation of the pedals may be restricted due to unsuitable footwear such as:
  • Shoes with platform soles
  • Shoes with high heels
  • Slippers
  • When driving always wear suitable shoes in order to be able to operate the pedals safely.


WARNING Risk of accident when switching off the ignition when driving
If you switch off the ignition while driving, safety functions are restricted or no longer available. This may affect the power steering system and the brake force boosting, for example.

You will then need to use considerably more force to steer and brake.

  • Do not switch off the ignition while driving.


DANGER Risk of fatal injuries due to exhaust gases
Combustion engines emit poisonous exhaust gases such as carbon monoxide. Inhaling these exhaust gases is hazardous to health and can lead to poisoning.
  • Never leave the engine running in an enclosed space without sufficient ventilation.


WARNING Risk of skidding and of an accident due to shifting down on slippery road surfaces
If you shift down on slippery road surfaces to increase the engine braking effect, the drive wheels may lose traction.
  • Do not shift down on slippery road surfaces to increase the engine braking effect.


DANGER Risk of fatal injury due to poisonous exhaust gases
If the tailpipe is blocked or sufficient ventilation is not possible, poisonous exhaust gases such as carbon monoxide may enter the vehicle.

This is the case if the vehicle gets stuck in snow, for example.

  • Keep the tailpipe and the area around the vehicle free from snow when the engine or the stationary heater are running.
  • Open a window on the windward side of the vehicle to ensure an adequate supply of fresh air.


WARNING Risk of accident and injury due to being under the influence of alcohol and drugs while driving
Driving when under the influence of alcohol and/or drugs is an extremely dangerous combination. Even small quantities of alcohol or drugs may affect your reflexes, perception and judgment.

The probability of a serious or even fatal accident greatly increases if you drive when under the influence of alcohol or drugs.

  • Do not drink alcohol or take drugs while driving, and do not allow anyone to drive who has been drinking alcohol or taking drugs.


WARNING Risk of accident due to the brake system overheating
If you leave your foot on the brake pedal when driving, the brake system may overheat.

This increases the braking distance and the brake system may even fail.

  • Never use the brake pedal as a footrest.
  • Do not depress the brake pedal and the accelerator pedal at the same time while driving.


NOTE Wearing out the brake linings by continuously depressing the brake pedal
  • Do not depress the brake pedal continuously whilst driving.
  • To use the braking effect of the engine, shift to a lower gear in good time.


NOTE Damage to the drivetrain and engine when pulling away
  • Do not warm up the engine while the vehicle is stationary. Pull away immediately.
  • Avoid high engine speeds and driving at full throttle until the engine has reached its operating temperature.


NOTE Damage to the catalytic converter due to non-combusted fuel
The engine is not running smoothly and is misfiring.

Non-combusted fuel may get into the catalytic converter.

  • Only depress the accelerator pedal slightly.
  • Have the cause rectified immediately at a qualified specialist workshop.

Limited braking effect on salt-treated roads:

  • Due to salt build-up on the brake discs and brakepads, the braking distance can increase considerably or result in braking only on one side
  • Maintain a much greater safe distance to the vehicle in front

To prevent salt build-up:

  • Brake occasionally while paying attention to the traffic conditions
  • Carefully depress the brake pedal at the end of the journey and when starting the next journey
    Starting the vehicle via Remote Online services

    ECO start/stop function

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