When I got my mechanical oil pressure gauge in Sept I had a crankcase full of 5w30 dino. Pressure was 53 psicold, and hot was 36 @2000 rpm and 16 @ idle (700-800). Spec for this truck ('95 F150 300 I6 with 100,600 miles and runs great!) is between 40 and 60 at 2000 rpm hot. So then I filled the crankcase with 10w40 dino and the pressure is the same cold, but hot is 45 and 22. But really, I don't know that 36 was really all that bad. Maybe the 10w40 is overkill. If I back off I would probably go with a 10w30. Anyway, I am looking for your advice, opinions, suggestions and maybe I will make a change.