With FE 489 cu.in.(alu block) running steady :
my normal
oil pressure is 75PSI at 2850rpm
with
oil temperature of 125°F
and 72 mph (130km/hr)
with an outside air temperature of 60°F .
Oil is synthesis 5W40.
When I start the engine, the initial oil pressure goes up to 120 PSI at 800 rpm and I let it warm up and drop until it reaches less than 100 PSI and a minimum temperature of 110° before moving the car.
At steady idle, in traffic, the values are:
800rpm
125°F (oil)
30 PSI.