Id say turbo seal then. Pull your innercooler boots and see if youre getting oil in them if you are its the turbo...
I had a couple buddies that put my stock turbo back on my truck a long time ago when I was working 2 jobs... they failed to unplug the return oil line and I fired it up... sure enough white smoke!, oil out the exaust and some oil getting into the Innercooler but thankfully it wasnt long enough to fill it with any amount.
:bang ironically one of em has a diesel show now