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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.
How many miles are on your car. I used 10w40 normally or 15w40 because I had a high mileage motor and it slowed my leaks somewhat and I made better oil pressure.
Royal Purple Full Synthetic 15-40w
-expensive, doesnt make a huge difference, but I work at autozone and it's nice to know that at 300k you can trust not breaking something at redline