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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.
orange foam in the oil doesnt sound normal at all u might have a small leek around the intake manifold or a head gasket i would try retorqueing all of them.
Oil can have an orange or redish color to it. The problem is with him running Dexcool, it makes it hard to be certain it's NOT coolant, especially since he's losing some.