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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.
10w30 in the summer, 5w30 in the winter --- the reason for that is because 5w is easier for the engine to crank over with than 10w in the winter time, because its so cold outside --- that's if you're in a cool area i guess lol. i'm from illinois, maybe you're in florida???
there's no point to running mobil 1 oil unless you've done it since the engine was new. don't waste your money. i usually use castrol, but i got some penzoil for free --- i'm not complaining