UK Car Repair Questions? Ask a Mechanic for Answers ASAP
There is always oil coming through the intake- due to the small amount of seepage at the turbo seals, which is normal. If you take off your lower hoses you will dump out a half cup or more.
This oil gets flung around in the air, and will stick to any surface it contacts, and will run down. There are just certain areas it tends to collect, as there are obstructions in the airflow. It's been like this on every generation of the diesels.
The EGR tends to get more sooty and dry deposits over time, not wet and runny.