I also have a fairly fresh rebuild. I have 50-60# at start up. I sat in long traffic one day and noticed the oil pressure close to 0 at idle. I put in a mechanical gauge and it has never been below 15-20# since then. I changed the oil out to 20-50 Valvoline that I had on hand for my boats motors and also added a bottle of ZDDP additive. Not to open a can of worms but your not using a Fram filter are you?
