One one hand, I'd like to see Amsoil run to too if they can live up to the 25,000/1 year claims...if you do put 30,000 miles on a year, then it wouldn't be the typical 10,000-12,000 miles on oil but the year mark has been hit, so the oil needs to be changed type of test. This would be a great test to see if Amsoil can indeed go 25k with what I think they speck 7,500 mile filter changes.
On the other hand, Delvac-1 (Mobil-1 SUV & Truck) 5W-40 or Delvac 15W-40 or Mobil-1 10W-30 or Mobil-1 0W-40 or Chevron Delo 400 15W-40 (or 10W-30 if you can find it) or German Castrol 0W-30 would all be great tests.
Perhaps you could add a new air filter (making sure it is sealed very well) and run the oils all 30,000 miles with 7,500 mile filter changes...much like 3 Mad Ponchos is doing with his Camaro...this way we could see how the Ford 4.6L V-8 wears. I'd chip in for at least one of two oil analysis...since we know that all the oils above should go 7,500 miles at least, you could change the filter, take a sample, top up to full, and keep running to 30,000/1 year - this way excess samples wouldn't lower the oil level so fresh oil would needed to be added.
What do you think? I know it's not the same test, but it might produce more benefit...of course, with the already aged engine, how many oils you'll be able to test may be limited...
Just some thoughts...
Chuck