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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.
a lot of the synthetic based fluids such as Valvoline and royal purple will already have it in it, if you buy a standard fluid ask for a small bottle of limited slip additive