when is the coolant changed during a BB service

[MSG2004]

Hello. My car will be 5 years old less than 20k on the clock FSH by MB - when is the coolant replaced please. I've googled/etc but not found a definitive answer.
Many thanks.

 

[Skd884]

Every 15 years on a w204 c63.

 

[alecmascot]

The factory fill coolant is not changed for 15 years.

 

[MSG2004]

Thanks all.

 

[markjay]

This is why knowing the car's full history is important... if the coolant was changed (e.g. due to coolant pump failure etc), and non-MB coolant was used, then the 15y interval might no longer apply.