3.0Tdi engine noise

[Robert91]

Hi guys,
I have been searching the forum and can’t find anyone with this issue ( if it is one ). I have a 2010(59) Audi A5 3.0tdi Quattro 110k Miles. I currently have the car up for sale and someone came to view it. We went for a drive and the viewer said that the engine sounds like it has a whining noise coming from it at low revs. It has sounded the same since the day I bought it last year and I think it is just the noise of the V6 diesel. Can anyone confirm if there’s has this noise?  https://youtu.be/b8jXdXGgWjY 

it sounds exactly like this.

thanks 

robert