Thanks, Docnick. That is exactly what I ended up with on my 2002 Sienna, which I had to park at 220,000 miles due to a change in Mexican import laws. Because of all the different opinions here on Cartalk, I decided to find out for myself, on my car, with my driving patterns: outside the Snow Belt.
I let it go well over 8,000 miles, and Blackstone showed all condition of oil, the detergents, contamination, etcetera, looked as if it would be good until at least 11,000. So, for a safety margin, I chose to change it at around 8,000 miles. And, I was well aware if I changed my driving patterns, or moved back into the Snow Zone, the figures would change.
Note I did use Mobil-1 EP. Though they say it will go 15,000 miles, personally I would rather not run it that long. Sorry if this was all duplicate.
All engine parameters were okay, too.