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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
My oil pressure was terrible. When hot it would drop to 9 psi. Last week i put in a new oil pump, pickup screen, crank and bearings. Now am at 50 when on throttle and 40 when at idle(hot).
When I first crank mine it sits at 90 PSI At idle. After it warms up it sits between 60 or 70 PSI while driving down the road, and 30 PSI at idle. I have a high pressure oil pump and 7qt oil pan.