DS3 1.6 HDi. What are the common oil leak locations?

[BecauseItsFrench]

I've just bought a 2015 DS3 BlueHDi which appears to have a substantial oil leak. There seems to be a lot of oil pooling around all 4 injectors, the top of the gearbox is absolutely plastered with oil, so much so I was able to take off clumps of sludge in my hand that were about 2-3cm in size.

As far as I can tell, there's no leaks from the rocker cover. There is some oil in the throttle body, but I'm not sure how much is "normal" as I know a small bit usually gets past the turbo/intercooler. But given how much oil is over the gearbox, i thought the engine would've ran away by now if there was that much oil getting to the throttle body!

Does anyone know of any common leak locations with these 1.6 HDi engines? I've attached some photos to show how much oil we're talking but to be honest the photos don't do it justice.

Thanks in advance!

[Fiddy]

Did you have any joy on resolving this leak ?

[Fiddy]

Injector clamp screws are common 2 per injector 7mm Allen Key Fitment - 7Nm + 65’ Angle