As Pat noted in a video I posted recently, my oil pressure was dropping quite a bit at idle, and it was continuing to get worse. I was thinking the worst, and I am not prepared for another motor. Pressure was dropping to about 25-30 at idle, but it would get to the middle mark of 40 under acceleration.
I was running 10w-30 Valvoline with an AC delco filter, and it only had about 1500 miles on it.
I changed it yesterday. I put in some 10w-30 Mobile 1 High Mileage with an AC delco filter.
Pressure is now a tick above 40 at idle, and moves to about 50-60 during acceleration. I am very impressed that just a simple oil change could do such a thing. Long live my L67!