My oil pressure is going away.....

What is the water temp most often,,,when its 100 plus outside? No oil temp gauge I take it, the police mopars had engine oil coolers.

You can get high zinc oil @ 20w-50. Back in the 70's people all the time used that or straight 30 weight in the summer in these motors that were going on 10 years strong.

Oil filters can block the flow, some claim Fram filters are the worst for clogging up. k&n race filters and the like don't filter as fine in order to allow a high rate of oil flowing.

I would for sure change the oil filter if its been on a while or is a Fram or the like name.