C30 1.6d Drive e Turbo flutter Blow of?

Hello, for some time now my turbo makes fluttering noises. The sound resembles this Fast and the Ferious sounds, at the beginning I found it kind of funny, but now I worry that it hurts the turbo. The sound arises when you go under load from the gas. The best described can be described as a Chu tu tu tuuu. Somewhere in my back of mind I think of a broken blow of, but does the small 1.6 diesel have one at all? If so and where would it be possible to find it? Repair feasible? Cost? In addition, my turbo has always lost some oil for a long time, but it always kept in limits and by annual oil change I never had to pour oil. By the way, the car has now already 240000 kilometers on the clock. I hope someone can help me with the problem. Greetings from Hessen