Took the undertray off earlier - it's very hard to tell where the oil is coming from - the crossmember is oily, as are the pipes that run underneath the front of the engine, the PAS pipes etc
The highest point that I can see oil is by the casting that goes into the sump (dipstick or possibly a turbo oil drain?):
but it could be spray from a leaking PAS pipe or similar. The front of the engine also looks oily from the little you can see of it, but old dried oil rather than fresh. Lying underneath and getting someone to turn the wheels from lock to lock with the engine running doesn't show any spray or similar from the PAS pipes.
The 'wet' oil is black like engine oil, but doesn't smell 'sooty' like oil from the dipstick. The stuff in the PAS pot doesn't really smell of anything (and I'm not gonna do a taste test!!). Engine oil level hasn't dropped at all, PAS pot doesn't have a dipstick but if you stick your finger there's oil in the pot (but it's not to the brim!)
Any suggestions?
Also - on the passenger side at the front, there's a plastic pipe that runs from the top of the front diff, along the front of the engine, round the serpentine pulley and on up. Is this just a raised breather? Where it runs close to the serp pulley it's touched and worn through.. 
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