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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.
On my 88 with 112k miles I have a very slight leak on my rear main seal but I never have to fill it between oil changes and my oil pressure stays at around 30 at idle.
Mine didn't drop before, but I have major oil leaks coming from my valve covers. How stable is the oil pressure gauge suppose to be? mine is ata round half when its driven and when idling it drops down to zero or bounces around between nothing and the first knotch... is that normal?