Hello, My buddy bought the Opel Omega, this time the new model with a 2.5l DTI engine and automatic transmission. Now he has a problem, and annoys me. He thinks there is a whistle coming out of the engine compartment at approx. 2000U/min with load, i.e. when giving gas on the track or on the mountain, always a whistle or howling from the engine compartment (seen from the driver’s seat the whistle comes from the engine compartment to the right). The whistle stops from approx. 3000U/min again. Meanwhile, the entire turbocharger has already been changed on guarantee and also some hoses. But the car still whistles 🙁 According to FHO this is a normal whistle, but he doesn’t want to believe this and I haven’t read anything about this yet. Can it also lie many times on the viscolufter? Can you give me here tips on what it is? Or is this whistle really normal?