I guess I am not concerned with the reduction in
oil pressure as much as the sudden drop above 4k rpm. in other words if I just had low
oil pressure I would crank in on the
oil pump rv adjustment. It is the sudden drop from 50 to 42 psig that has me stumped above 4 k rpm. so it drops from 4K to 4.3K than holds seady at 42 until 6k rpm's.
I imagine I could passify the issue with cranking in on the oil pump rv setting. but i wonder if i would still see the step change in oil pressure.