Hello,
I have problem with Gram reciprocating compressor.

When oil is cold and the compressor starts, the oil pressure is 2,9 bar.
After operating for 20 minutes on 100% capacity, oil pressure gradually dropping to 1 bar, and the compressor stops.
After standing ca 30min, and starting compressor, the pressure was 1,5 bar, and again slowly falling.

Oil filter and oil have been changed recently.

Any help will be appreciated!