I have sorted that out few months ago. I tightened 2 bolts under turbo, that holds oil return pipe in place, there was a leak, because I didn't tightened that properly. and I had oil leak(compression leak) from the egr valve. I used home made gasket with original metal one, this sealed that even with one of the bolt threads ruined(overtightened). My advice to you would be: Check for any oil leaks, if there is any then find out from where its coming from.
Was there excessive oil residue when you removed inner part of EGR?
If there was, then oil from crankcase is entering intercooler.
Now I have new, strange problems. Loosing engine coolant... no leaks, no traces of mayonnaise in oil.... I will investigate these issues this weekend.
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