white normally means coolant, but when you are dealing with hot turbo's they will burn oil quikly enough to turn it white. I doubt with a new engine you are having a coolant problem inless it was due to the install.

My guess would be either your turbo seals or your oil return line.

Is the turbo new? Does the oil return line ever flatten out or go back up? Is oil getting past your intercooler (more than normal)?