For now, I'm skipping ahead from post #118 to here to make a comment. MAYBE I haven't missed anything. I finally just had to read the thread to see what all the "buzz" (coffee buzz) was about.
This thread brings back several memories. The first is, back in the 1980s at work, we had a 'beater' Chevy Truck that leaked some oil but probably burned more than leaked. It was getting too expensive to put in a new quart of oil every few days. We resorted to using used oil. Shortly thereafter a guy a few door down would give us his 5K synthetic oil with 5000 miles, 8046.72 Kilometers on it. His Honda was new and his old oil still looked new. Now we could do an oil change with filter. After that, we would top of with his oil and when it started to turn some in the Chevy, we would change the filter. He was delivering Pizza in the Honda.
Another Pizza story... Back in the summer of 1985 both me and my brother were delivering pizza at night after working 40 hr a week, day jobs. We both had cars with primer on them. Mine was a 1966 Mustang that was Tahoe Turquoise with small and large swatches of red but closer to brown primer spots on it. Brother's was a 1978 Fairmont with silver paint with horizontal strips of brownish primer on it in various places. It was old brick kind of color of primer. One of his friends would call the paint scheme "urban camouflage". One evening after the July 4th screw over which is a separate pizza story the boss Manager stopped us at the counter on our way in for a shift. He said to my brother "You can't deliver in your car until it has the new paint on it". I asked about my car and he said the same. Brother said that he was going to have to quit and then I did too. Manager then said that he doesn't know what he was going to do about delivery drivers that evening. Then I remember one of us saying something about that being his problem. All I can say is he shouldn't have scheduled us to work July 4th and the primer thing compounded the issues.
Oh, about the 4.0 SOHC Explorer, and this may have been said, you can't remove the top half of the oil pan without removing the transmission.