Hello, I have a diesel car with 280,000 km mileage. It burns 1 liter of oil in 5,000 km mileage. I see blue smoke when loaded or when loaded without warming up. I wonder if it is from the turbo or the piston ring. I don't know exactly, or both. The mechanic said there is a slight gap in the turbo shaft, but he said it is not that. I used Shell Total oil. I don't want to put 1060 oil. It will damage the oil pump. I just changed that too. What do you recommend? I also see sweating in the turbo pipe. I need your help about piston rings or turbo. I wish you safe driving.