Hello jdemaris, Them old Detroit Diesels would drop to 5# or less at idle, when hot. At overhaul time, I would shim the oil pressure regulator about 1/8",with a stainles washer inside the regulator housing. That increased the cold pressure from about 50 to about 60 Lbs., and the hot idle pressure from 5# to a least 10#. Low oil pressure lights used to come on a 5#. That way the drivers would not be complaining of the low oil ligth coming on at times. Oil type and temperature would play a part as well. But that 1/8 shim did the trick! Guido.
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