On Oct 24, 9:48 am, hookipa wrote:
I recently moved my boat from New Zealand (cold water) to Tonga (very
warm water) and I am now experiencing very low oil pressure at
operating temperature at idle. ...

I doubt that the problem is the water temperature. As you know lots
of folks make that trip and don't have this problem. I'd change the
oil out for a heavier weight and see if that helps.

-- Tom.