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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 friend of mine has a 5.0 with 174xxx miles on the engine. heads intake cam and a blower on this thing and its never been rebuilt. Higher milege 5.0's seem to need thicker oil, he even uses lucus oil stabilizer. Other than that there are no signs of the engine being worn at all.
-Green5pt0