He is the key, IMHO, it's hotter much longer in the deep South. When I entered my garage this morning at 7:30am it was already 88 degrees because of the sun. It'll be almost a 100 by mid-summer. You'll be running the AC in it for 8-9 months too, even in the dead of night during the summer months. My cars are at operating temperature in under a mile, currently. Add in some mountainous terrain, stop-n-go rush hour traffic, or a heavy right foot and I think you'll see much higher oil temperatures than a nice steady cruise in flatlander midwest states.
Look at Ford's spec for 5w20 oil. What's the major difference from regular dino? The Sequence IIIE tests for double the hours (128). In other words, running at extreme temperatures for double the amount of time.
