In this video I show you the complete process of replacing the positive crankcase ventilation (PCV) system on a 2018 GLC300. This is the same for all 2.0 L 4 cylinder Mercedes from 2015present including the C300. The part I replaced is 2740905600.
https://www.fcpeuro.com/products/merc...
This fixed a check engine light and diagnostic trouble code, P052E. Enjoy!