Turbo whinning noise.

[Kobus]

I drive a 2008 3.0 sd X5. Last year around august I smelled oil when parked and I get out. BMW loked at the car and sais the turbo`s need replacement. They did such a bad job with oil leaks all over and the boost pie from the Turbo to the intercooler came off! 45000 km

During February 2010 I came back from the coast and heard this whinning noise, no loose of power just a high pitched noise between 2000 -3000 Rpm. Last week towing the boat the noise was much louder at lower Rpm.
So I decided to strip the motor down and remove the 2 turbo`s. 60 000km

I took the whole front end off to access the turbo`s. During removal there was once again oil on the motor and suspension, coming from the boost pipe that leads to the intercooler. On close inspection I noticed the pipe was damaged. Will have to re sleeve the pipe to ensure a proper seal this time.
As I got to the top Turbo I noticed that the flange between the 2 turbo`s and manifold was not properly bolted down. The small turbo was full of soot from the exhaust. Then I took the gasket and inspected it. The exhaust gas was leaking through gasket as it is made up of thin plates. So the whinning sound came from there. I blew the gasket with compressed air and got the same sound!!
However I send the turbo`s for servicing and ordered new pipes and gaskets. yes yes Motorplan what about it I can not give my car to butchers i am sorry!