Hallows, at the moment I have a somewhat “larger” oil problem with my Citroen C4 1.6 HDI BJ 09/2009 229,800 KM. I have already changed the valve cover including gasket, and cleaned everything. The screws again after it sat down, nevertheless oil loss. My guess is the gaskets in the intake manifold, because when gas is given, an escape of air/charge pressure is perceived as if the engine was leaking. nread where the oil could come from, where reference was made to the turbo, around turbo dry, transition minimally damp (due to design), the KGE, also dry and valve cover, this has already been replaced, original part, or reference to injectors/injection nozzles, these were replaced not all too long ago with the previous owner, the car was always in the same workshop for maintenance purposes, 1st hand to 207tkm. However, was mentioned in an English forum, if a “zisian” ” is perceived, so the loading pressure escapes, that the intake manifold seal/s are defective and can also escape oil there. On the photos you can see the oil.