Same thing innit? Wikipedia thinks so.
Ah, the problem with the X-trail is the intercooler leaking at the sides.
The leak (air) makes the turbo overboost to compensate which eventually kills it.
Any oil which is in there from turbo bearings leaking a bit also leaks out rather than getting burned.
(ie it's not intercooler leaks oil into the turbo, which would be a bit surprising since the intercooler is after the turbo, not before it)