Ac-System, Oil, Refilling [2016 | 2017-2018, B4204T11]: Leakage

The compressor oil must be topped up when repairing a leak or when replacing a component. The quantity required will depend on whether leakage has taken place slowly or quickly. 

Fast leak (for example hose rupture). Fast leaks normally mean loss of compressor oil with refrigerant. 

Slow leak (longer than 24 hours). In the event of a slow leak, there is not normally a great risk of loss of compressor oil.