Paccar MX low oil pressure problem

Got 2010 truck in workshop.

At idle oil pressure is less a 0.8 BAR. When engine revs to 1000 rpm it is about 1500 ore more BAR.

At max RPM all is OK - 4-5 BAR.

Looks like internal oil leak. Does anyone had this problem before?

 

I used data from OBD connector too.

ESA reads the same

 

i tried to swap oil pressure and fuel pressure sensors (the same part #) and other sensor reads the same pressure

 

This is oilsystem description.... From Holland.

This engine is not so simple as it looks

 

May be, but oil pump is the most lubricated part in engine.

So I wanna check oil pressure regulator and geartrain

 

I removerd centrifugal filter, cleaned all filter unit with solvent, changed oil and start engine!

over 70 PSI on laptop! Ok, I tried mechanical gauge - the same figures.

I did test ride, but I cant warm up bobtail truck, so in monday I gonna find heavy trailer for test