I'm having the low oil pressure that throws the code. Cold pressure is around 20. It will go up to around 40 at highway speeds after it is warm, but seems to bounce around a lot. The oil pressure switch has been checked and I believe they just left the screen out that sits underneath. I don't know if the low pressure at start and the fluctuations are symptoms of it sucking air, like maybe the oil ring on the pick-up line or something else. I've seen the comments and videos on doing an engine flush and chaning that oil ring. I do seem to experience the intermittent lifter tick more often now. Related? Engine has 235k and got a new tranny a few thousand miles ago, so at what point do I just swap the motor out rather than all these band-aids?