[ischmitz]

Interesting discussion. I believe it's got to be some sort of pretty major leak in the pressure circuit that's bleeding off the oil during idle. You do need to tear into the motor again and find the root cause. If your oil flow is not sufficient you will damage lobes, cams etc. during idle. Did you check the bearing clearances during assembly? Maybe the line bore required oversized mains. I also like the assumption of a bad/pinched O-ring on the oil pump to case. How about plugs of the crank oil galleys. Can they come loose and fall out?

BTW: I once tried to battle the opposite issue with my 3.6: The oil pressure is great but will never go higher than 4.5 bar on the 964 gauge unless the car engine is stone cold. It gets up there but pegs sligtly under 5 bar. I changed the two springs in the oil pressure reliev valve and the saftey valve believing this was my issue. But it still acts the same. Of course I have not used calibrated pressure reading equipment to verify whether my gauge and sender are reading accurately. However, my idle oil pressure never makes the idiot light so much a even flicker. Not even when it gets really hot under the hood.

Keep us posted on what you find.
Ingo