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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.
10-30 Castrol warm up engine and make proper adjustments. Now make 10 20-60 mphr acellerations at wot. Let engine go back down to 20 mphr on zero throttle. After this flog the bitch as you see fit. Oh, almost forgot change oil and filte rafter the 10 cycle. Bubba
My engine builder recomends using break-in oil with zinc in it. From what I understand the zinc coats the bearings and other parts and helps with longevity.
5w20 is what I use. You need an oil that's as thin as you can get it on cold starts so it has a higher viscosity to start with. The thinker the oil, the worse it is.