Thank you guys for trying to help.

It's it like a bag of marbles being shaken or a knocking?
Yes, it is.
Check the obvious like oil level,
Changed oil and filter recently. No difference in before and after.
check for a broken fan shroud
Checked. Not this.
Marble sound can be a Vanos unit
People with this problem say the hear the sound while start an engine and idleing. I have this sound when speeding.
cam bearing or lifter
How to chek those?
Most often it's low oil.
As I said, oil changing doesn't work, but gaz quality plays a very noticeable role. However, despite the best gaz using the sound becomes not so loud but still exist.
Knocking is sometimes a bottom end problem but with such low miles I would not think thats the problem.
Kcnoked EVERYTHING! F*** All the things look solid and reliable.

Some other advises?
Thanx!