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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.
Thanks, I took it back down to 10* but it had 91 octane in it when I did it, so I dont know what the problem was. Thanks a lot for the imput though, although it is only 1* above what it was, it runs a little warmer. But not even close to hot, just was wondering.