I did this a few weeks ago. Just now saw this thread though. I did the non-starting method w/ the wheels off the ground, lock to lock about 3-4 times. Used Dorman vacuum caps to plug the reservoir and used about 2 - 2.5 qts of Valvoline PS to flush.

What's a good internal to use for this PS flush?
I was thinkin about 45,000 miles based on the various articles I've read online. I would obviously monitor the color along the way. 45,000 miles would take me 3 years.