It may have a thin break in
oil, in the engine, and we still do not know if the gauge is accurate. To early to tell if there is a real problem.
Warm idle
oil pressure will drop off the most if there is a lot of clearance someplace, but it is not necessarily a good indicator of the likely hood of an engine failure. I have had people claim that the
oil pressure at higher rpm is more indicative of will the engine fail.
I had an old junk truck I used to haul firewood. It idled at 5 psi and only carried 30 psi at high rpm. I ran the crap out of it for 7 years. It was drove to the junk yard under its own power. I realize this does not compare to a $12+K FE. Just saying people may put more focus on oil pressure than it deserves.