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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.
a lot of gas odor in the oil could be a plugged up PCV valve system that ain't removed the blow by gasses that slip past the piston rings into the crankcase. if the PCV system is OK, then you could have really worn rings letting the gases get by and you need to rebuild the engine.