Mmmm, different turbo to ours, and nowhere near as bulletproof.
It does sound like leaking turbo oil seals along with a leak on the intercooler pipe or connection, but as you say, check for any PCV problems first.
There really isn't anywhere else that oil can get into the intercooler from other than the turbo, unless it is carried over from the PCV.
How much oil is it using?