Omega 2,5 DTi purchasing advice

Hello, I’m looking for a new towing vehicle Since the production of the Scorpio has been stopped years before the Omega, it is clear to me that I will eventually get an Omega. Today I have looked at the first 2.5 DTi (EZ 10.2002) today and have a few questions to ask. 1. The car has about 100,000 km down and in the TÜV report (2007 at 82,000km) was something of oil loss. If you have looked down on the right its on the engine ic Where can this come from? 2. Furthermore, I noticed a whistle sound coming from the right ( Turbocharger?) It starts at 2000 revolutions and is then not to be heard at 3000 anymore. At full throttle it is also immediately gone. You can hear it best when you lightly give gas. I tap on the turbo, but is that normal? At other TDIs you can hear the turbo, but my opinion only when you also give gas… 3. Except that you can discover a lot of oil slags. should have removed these flaps from the intake bridge, I can not read much extremely negative about the vehicle and moter or am I wrong? 4. Has anyone already missed a particle filter for this car? 5. Should I pay special attention to something else? (except for what already stands for the Ankausberatungs Tread) Thank you!