Lower oil pressure in flight than on ground

[bennettflys]

Piper Comanche 180
Lycoming O360-A1A
Started up today, oil pressure in green (65-70PSI)
Climb good, level cruise i look and it has dropped down to 45ish PSI (middle of yellow)
It very slowly goes down to 40PSI and remains stable there.
When I landed, slow down to idle, it comes back into the bottom of green.

I am running around 4qts (minimum 2 max 8)
seems to spit out anything over 5.5.
I had a short flight planned and will be changing the oil this week due to 50hrs, so I didn’t want to waste any.


Any ideas?

 

[magman]

 

[philiplane]

 

[bennettflys]

 

[bennettflys]

 

[Reece]

 

[NorthernAviation]

 

[Ogie_ogelthorpe]

 

[TEG916]

 

[Ray93J]