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I'm assuming that an XUD9 is fitted transversely, so do you mean behind the sump when looking at what is actually the front of the engine or do you mean behind the sump when looking from the front of the car?
If the former, I'd suggest rear main seal because behind the sump is the gearbox and the rear main seal keeps oil in the rear of the engine (hence the name.)
If the latter, it looks like the exhaust side is the back of the engine bay, so it could be rocker/cam cover gasket is leaking and oil is dripping down the engine all the way - you should be able to see evidence of that. Or as the turbo is also in that location which is most likely oil cooled, the turbo oil pipework could be leaking.
NurseHolliday-
thank you for your help. i am thinking big end seal, it leaks when not in use and, although the oil has got everywhere, now that it has been sat for a while it definitely seems to be coming from somewhere lower the the rocker gasket or the head as the amount of oil is so much greater lower down. turbo oil pipe work would be quite easy to get fixed, again too high up. I have been reading that a big end seal redo is a major job. if it is this is the car going to catastrophically fail as long as i keep it topped up? how much would it cost to get done or does anyone want to give us a hand doing it? I read this https://www.205gtidrivers.com/forums/topic/175147-turbo-diesel-big-end-seal-leak/
which is for a similar engine to mine.
tmevans
I have an oil leak, it drips even when i not in use, the car has been parked for a week currently. This gives me hope that it isn’t serious (like not the head) if i get under it, it seems to be dripping from the back of the engine. It isn’t gear oil, it’s engine oil. XUD9 what’s the thing immediately behind the bottom oil reservoir/sump of the engine. car drives fine and levels are good, just a mess of splattered oil