Hello guys, I am at a loss here and I would appreciate some ideas.
I recently bought a w123 200D that was really cheap for prices here in Spain, no rust, perfectly preserved, always slept in a garage etc...

The issue is the car shows 0.3-0.5 oil pressure at iddle, which is above the 0.3 minimum requirement in the OM615 manual, but not normal in any way.
The thing is I brought the car using the highway and the car never got hotter than 90Cº and as soon as I pass 2.000RPM the oil pressure goes up to 3 and stays there as long as I don't go back to iddle.

What could be causing this? I thought about the bearings or a head gasket issue but since the engine is not overheating, I have no smoke, when RPM go up I get to 3 oil pressure and the engine starts and works fine I am wondering where this is coming from.

I recorded two videos to show you the issue in detail:
1- https://www.youtube.com/shorts/PRLVvnOqDwE
2- https://www.youtube.com/watch?v=c7KMB8EjbEU