The car has a new timing chain, guide rail, and tensioner. The symptoms are the same with respect to oil pressure when hot. So, new bearings rear and front seals, oil pump.... and a couple thousand dollars did not "fix" the symptom on the dashboard gauge.
I think it runs much better than before but the oil pressure still goes to zero at low rpm like once it gets hot like in heavy traffic, then it's like an old diesel with respect to the of sound of knocking and lower HP. Could it be something simple like the oil filler cap? Maybe the valve guides need replacement? What should I try next?
Any expert opinions what would it be better to let it go or keep trying to fix this?
