Well, i have the same engine in my Mustang, but I take a lot better care of cars than my boys do. Hopefully I'll never have to see the inside of my engine for a long time.
The thing about the modern OHC engines is, they take a 5W-20 a lot of times be cause the oil passages are small going to a component, such as a hydraulic tensioner. Heavier oil no longer means more protection because of that. Pointy-headed engineers doing their thing on the common mechanic.LOL!