25/40 pounds at idle would be normal oil pressure in a run in motor.
If your running your motor in,,then your gonna want to change your oil and filter more frequently for a while,( i would change it first after 150 mile,,,and then again after 500 miles),,I stick with straight wieghts,,,non of this 10w or 20w crap,,,it's just a hold over for me from my day's as a diesel mechanic.
Typical big diesel engines will go over a million miles before rebuild if they are properly serviced.
I use straight 40wt oil in all my vehicles, and i have never had a failure due to insufficient lubrication.
But then i also use a cheap oil to flush my motor first( I change oil and filter the first time and put in cheap oil) then i change filters again and put in the good old 40wt.
also decide now whether your gonna use synthetic or standard.