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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.
Unless you live in AZ or other hot climate states, 10W40 is overkill. 10W30 is best for states that have 4 seasons. But be aware if you drive your car during winter where it snows, you'll want 5W30 in it during those cold months.