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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.
Just go buy another quart and you will be fine. My car usually only takes 4.5 quarts too. And I drain that biatch pretty damn good. I jack the rear and pull the front plug on the pan and than I jack the front and pull the rear plug on the pan so it shift all the oil. And I make sure that the oil is warm so it comes out a little thinner.