Two days ago I installed a mechanical oil pressure gauge because of the wonderful factory gauge is misleading me. Well at first I thought everything was good, on cold startup reading about 50 psi. Well after driving about 10 to 15 miles and getting the truck nice and warm the pressure will stay at about 20 psi, but as soon as I come to a stop it will drop to around 5-10 psi, but no knocks or rattles that I can hear. The truck has a fresh oil change with 10w40. I have searched a lot over the past few days and I've gathered the following ideas, bad pump, clogged screen, I know this post is probably rather redundent but I am in a position where I cant go with the truck for more than 3 days or so. So please anyone who can help me out with insight please feel free to, or should I start praying to the Bronco god.