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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.
I doubt the manual on that car said anything about 5w-30....anywz 10-30 sythedic oil will do vey well unless your in a very hot area them the 10w-40 would be better