Scott 70

The truck runs normal. It is supposed to have newer rings. When I open the air on my tank and it goes down the oil stops leaking by 90%. The hole in the piston of the air compressor. Could be it. The compressor builds pressure normal and seems to work great though. But it appears that the compressor is putting air in the oil pan. 

Thanks you for the help so far!

Looking for some help on my 69 Mack R611.  I'm having  a lot  of oil come out of the oil fill /  lower breather tube.  The top breather on the motor is clear and flowing good with very little or no oil. My air compressor is also getting   some oil in the air system. What could cause my oil pan to build pressure? 

Thanks for any help.

Scott