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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.
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I had a Peugeot 309 as a first car and was told that they all leak oil, just keep topping it up when needed!
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NurseHolliday
n3il
@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