Earlier today, I noticed that my oil pressure was dropping to almost zero while idling, and it continued to do so for the next twenty minutes (at idle; it was in normal range while under throttle). Later on this afternoon, however, I took it out, warmed it up, and now it does not drop below the first bar. I replaced the oil sender less than a year ago. I will have it checked out tomorrow, but in the meantime, I'm curious; what is the normal oil pressure for a 500E, with approximately 150,000 miles? I use dino 20-50, oil was changed less that 2000 miles ago.

Thanks,

Tom