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I restarted my car after filling up the gas tank tonight and the DIC reported “LOW OIL PRESSURE”. I notice the oil pressure meter was sitting on zero. So I immediately turned the motor off and checked the oil level, which was full. I restarted the motor and the oil pressure came up to 17-20psi at idle, which seemed low? While driving home and the motor was revving the oil pressure seemed normal 35-50psi but while idling the oil pressure would drop to back down to 17-20psi.
I was just reading your post in the tech section and I was thought I went crazy for a second when I couldn't find my response.. Just realized there are 2 posts.
Just for a reference my engine had about 35 psi at idle, like yours, before I swapped for a ported pump,. It is now about 51psi at idle.
I believe the "Low Oil Pressure" light gets tripped when there is < 10 psi. Check your sending unit and check actual pressure first. If you find it to be low it may be time for a new pump, but to be honest @ 8500 miles I would be suprised if is the pump