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Indeed. Using 5 litres of oil over 2000 miles would leave some kind of evidence.
I'm with Watsey on the turbo. It's either filling the intercooler via the cold side, or filling the DPF via the hotside.....or both ends at once. Regens will quickly burn off the oil. I think the failed upstream O2 sensor is a clue as to where the oil is going. Diesels don't normally kill off O2 sensors like the high powered petrols do.
If not the snail, it can only be the cylinders, which is why I suggested the injector removal for a clean up and do a compression and leak down test whilst they are out. That would be chargeable though as it's a fair chunk of labour.
Can't be rear or front crank seals either as you'd have absolutely massive oil splats everywhere underneath.
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