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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.
Mine has two ribs on the bottom of the tube and it looked like it wasn't all the way in b/c I could see the one rib....take a closer look at it and see if this is your problem. Also, if you know about how much oil you had in there before, check that and see if it looks the same.