Loose tube, what is it for?

[TyCromwell]

Hi, what is this tube for? Also mine seems to have frothy residue inside reminds me of when my head gasket went on my car.

 

[Cortes]

Hi

Rasseln. Was soll ich tun?

 

[kayburn]

Try to find ist in english :
Kurbelgehäuseentlüftung
crankcase ventilation
Google Übersetzer ist schon eine erstaunliche Erfindung

 

[Der Raucher]

That tube is part of the crankcase-ventilation.
The "appendix" is without any function in our engines.
Just clean it (maybe once in a year) from that oil-water-mix...