C220 CDI Merc oil leak

[Faker]

Mates C220 CDI (diesel) has a little oil leak at the front of his engine. We've taken a pic as you can see. It's just beside the servo vacuum pump on the head. Anyone able to shed any light on what the component is that needs changed? Thanks in advance

[Station]

I can't see from the photos - are you sure it isn't diesel, I know my (and everyone elses) 320 engines leaked from the injectors. They do leak quite a lot (search for black death).

[twosmoke300]

From that pic it looks like the common rail pump that's wet .

Also change that alt belt ! It's fucked