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Do you have a check engine light on? Even if not, it may help to get faults read, as diesels are tricky to diagnose for people who don't work with them a lot. Many of the symptoms require reading data value blocks and comparing them to known values. Autozone or other large chain parts stores will read faults for FREE.
It sounds like you may be overfuelinng, often due to a bad coolant temp sensor.
Ok, that makes it easier. There will always be a certain amount of oil in the intake due to weeping of the turbo seals. I would disconnect both of the air hoses low down on the cross pipe behind the radiator and drain all this oil, it can be several cups! And I would have faults scanned, but likely you have a vacuum leak due to cracked hoses in the PVC system. Start at the end of the valve cover at the rubber "y" pipe and inspect those lines for cracks.