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My oil pressure when hot at a stop light will drop to 5 psi. However during a long idle it will come back to 10 to 12 psi. My uncle was a supervisor in a DD overhaul facility, and he told me that 1.5 psi per 100 RPM was all that was necessary. I have spent the night many times on the road (bench seat) and in cold weather I let it idle all night. However I now have either a broken top ring or a head gasket problem, I have not opened it up yet to see. Will post what I find. I am leaning toward a head gasket. I stopped to have the oil and fuel filters changed at a major truck facility. After installing both primary and secondary fuel filters they could not get it to start. They ran it on ether (two tall cans worth) trying to get it to bleed. I sat in the customer lounge listening to it hammer on ether (they do not let customers into the shop) and was about to die. I got the mechanic's attention and was able to advise him that is was very easy to bleed, he must have a air leak on one or both of the fuel filters. Sure enough the primary filter can was not seated in the groove. Once it was seated the truck started. I have been wondering if that event could have started a head gasket failure.