Have you checked all your breathers are clean? you might be sucking up some oil.
Also worth checking incase you have a oil leak and its just oil dripping on the exhaust or something, i had that happen before, was just a small drip from the turbo oil return that got bad on full acceleration and high revs due to increased oil flow.

Also mate never use sinthetic oil on a new engine. You must use mineral oil for the bedding in of the engine.

Matt.