Confusing Oil Pressure / Temp issue

[amexbmorgan]

Anyone chased this down before?

IO306C non Turbo

Oil pressure is fine cold. Once Temp rises, oil pressure falls off, just out of lower green. When in this mode, oil temp never gets to 180 in cruise. But can get to 180 after flying and taxing back.

So, I would say oil pressure stabilizes around 25psi, oil temp around 120 in cruise.

I have checked and replace the oil pressure relief springs, plunger, valve seat, etc.

Went to a single weight oil. One flight it was fine. Thought that was the issue. Then next two flights stabilized at 25 psi and 120 temp again. Outside temp didn't make any difference. Flew when it was 100 and once when 70 outside temp.

Before I assume the pump, which could be, I will be checking the gages for accuracy. Both pressure and temp.

This is a new to me engine, so unfortunately I don't have history.

Other thoughts are internal gasket leak. Would an internal accessory case gasket leak do this as well? Basically oil pump pulling air?

What is confusing to me is low oil pressure and low oil temp. If I had a bearing issue, wouldn't the oil temps be rising?

Thanks for any insight!