On the old setup on my turbo 4g64, when I ran Mobil full synthetic 5w30 with the OEM filter, it wasn't odd to see 2psi oil pressure at idle. I just thought it was normal since the light would never come on. But then I was in a bind one day and needed to use a Bosch filter and all of a sudden oil psi at idle never went below 8 psi. This is when I started to think about oil filters. After that I went back to the OEM and idle would dip down to 2psi at oil pressure again. A week after that I crashed it.
So then I rebuilt the motor and I started running amsoil 10w40 with the OEM filter after the Balance shafts were deleted I did notice a spike in oil pressure at idle but no more than 12psi and it would drop down to 8psi once warm. Here's where it gets interesting, I ran into a thread on evom comparing the OEM filter to other filters and the FRAM filter was the worse and the OEM filter wasn't the best. WIX and amsoil ended up being the best one. So i tried it, now I don't see oil pressure at idle under 30psi and its damn near 100 psi at 70 on the highway. Safe to say I've never used anything else but the amsoil oil fikter
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