Never heard of a, properly functioning turbo, letting oil into the motor by design. I know diesels hold alot of oil, but by letting the turbos burn the oil in the exhaust side or letting the motor ingest the oil on the pressure side, would'nt this cause the motor to run low on oil? At least eventually? Makes no sense. As long as it's not one of those variable pitch vane turbos (think thats what they call em') and is sized properly, should be just fine.