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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? If it is a higher mileage engine, I would not switch to sythetics. the smaller molecular makeup can cause leaks in older motors......so I've heard. I use Castrol GTX 10w30 in my cars, but my stang will get full syn once it's broken in.
Yea GTX high mileage in carb motors and pending on the year it's generally good to say that the synthetic is better off in a 00'+ year models because the synthetic breaks down sludge in the motor and cleans it out too much in older models yada yada seeps thru the old cracks and fractures from age...I use the Castrol GTX High mileage with a quart of Lucas oil treatment.Works wonders and oil pressure is phenomenal. Any who im out , figured id give my input.