My oil pressure is going away.....
It was a NIB Mellings pump, supposedly high volume. I will note that it was 106 degrees yesterday.
I have checked it against a mechanical gauge in the past and it was accurate...or they were both wrong.#-o
The car has a set of electronic VDO Vision Series gauges.
Why not 20W-50? I dunno....10W40 is typical in this motor and it's treated with Zinc for my flat tappet cams.