Help for strange noise

[Maxim81]

Good evening, I have been buying a beautiful X5 e70 in 2008 with 120.000 km. The car was in excellent condition and did not give me problems until a few days ago. The current distance is 125,000 km, and I began to hear a noise that is valuable only from inside the cockpit. Having to describe it, I would describe it as a "ringing, which follows the revolutions / engine, but which feels more pronounced between 1500 and 2000 rpm.The first suspect I had was that of the distribution chain, but I think I can exclude it following the following characteristics / verifications: 1) noise occurs only when the engine is hot; 2) the noise disappears when I'm facing a curve on the right or left and comes back as soon as I straighten the steering; 3) the noise is audible however also in neutral with the car stationary; 4) a mechanic whose trust I tried to remove the services belt and the noise disappears. We tried to change the engine pulley with a new one but unfortunately the noise remained. These considerations have therefore made us think with some confidence that the noise don't comes from the chain, even if, as a result of this attempt I passed in bmw, w tell me it could be the chain. At this point I do not really know what to think. Is there anyone who can give me a hand? Thank you in advance. Sorry for my english, It has translate.

[740iS]

Can you make a video of the noise and post it here?

[Maxim81]

This Is the noise

[740iS]

Any chance you can get the recording from under the hood/bonnet and not from inside the cabin?

[Maxim81]

I can't listen It from outside

[740iS]

So you can't hear it from the engine compartment at all, even if someone helps you by slowly revving the engine? What engine do you have?

[Maxim81]

Exact, i try this, but haven't heard nothing. My engine Is 3.0 d. I suspect that Is located in crankcase valve but in all videos i Everest see, that kind of noise Is more louder than mine.

[740iS]

Unfortunately I don't know enough about the 3.0 d to be of much help. Hopefully someone with more knowledge than I will chime in.