Warped, i am quite a bit in agreement with you, as well. we know what the desert heat is like (Tucson, for me. Michael used to race in Texas, IIRC). as i recall, dino oil, if kept at 250* or more, for much of a period, breaks down much faster. our 5.0's can see 250 without breaking much of a sweat (though i might). as long as you can afford it, do the changes as you do. but for not much $$, but can get a UOA done and know how the oil is doing.
in general, guys running cheap dino oil often go 5K (based on lifespan/#'s from UOA's). we tend to be stuck on the 3month/3K mile stuff, though the oil can go longer. and i am as bad as anyone - i grew up with dino oil and the 3/3k stuff myself. ive changed oil that was 6 months old, with 20 miles on it (worries about water and sulfur dancing together and creating acid).
Michael puts it best - in essence, to each his own. no one is really more correct than anyone else.
i am watching the oil cooler thread - hoping to see some responses about what is the best way to go.
:OT: Michael, your brother went from the FJord to the big diesel..? hmmm, he is quite the connoisseur of fine, albeit vastly different, vehicles.