I did not see that you had checked the bypass at all, that is why I re-asked.
The issue you are reporting: intermittent low oil pressure goes hand in hand with an intermittent oil by pass sticking.
If it was excessive bearing clearances the oil pressure would be consistently low.
Anything is possible, but it seems that debris blocking a passage would also be consistent.
The oil pressure issue is intermittent, is that right? Sometimes it is fine, other times it is near zero at idle and maxes out at 30 or so at high rpm.
Or is it the oil pressure is fine when the engine is cold and goes to near zero at idle and maxes out at 30 or so when the engine is hot? Please clarify.
