I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked..Thank you for your attention to the rating requirement..
I would suggest a failing turbo or crankcase ventilation system. Yes it is urgent to get it fixed, definitely. And unfortunately yes, it will likely be expensive.
..Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.