Hi! I recently changed the oil. On an ASZ 1.9 turbo. After this engine start to loose power more and more, and to produce lot of black smoke. After 5 miles, barely can start to run in first gear, I thought it might be a conector or a pipe out, but I checked and looks ok to me. Also I thought it was overfilled but in the oil tub remained 0,5L which means they only filled with 4,5 L which is ok. I might need to replace the turbo, so I need a recommendation.... Thank you!