Don't like that noise!

That works!
I don't know about the 2.8 M52, but my M54 3.0 had a knackered fuel tank vent solenoid (situated at the front of the engine near the power steering reservoir). I bought a new (cheap) one and that makes a very similar noise on tickover (it doesn't run all the time but a lot at tickover). It's either that or tappets IMO.

I thought mine was a noisy tappet, but when I unplugged the new vent solenoid it stopped, so I know it is that.
 
That dont sound too good .
When you raise the revs bar the noise getting faster with engine speed does it change in any way
Eg quieter, more noise or just faster.

Stephen.
 
You're going to have to isolate the source, it sounds like its at crankshaft speed not camshaft speed if the engine is at idle during your video.
It coul also be something in the serpentine belt system, water pump, fan alternator. Try listening through a long funnel and pointing it around different areas to see where if you can locate the area the noise is coming from.
 
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