Another thing I noticed about this oil is that the car seems to reach operating temperature much faster. I have two Olds 5.0L V8's, one with 15W40 LL (summer only) and the other with 0W30 LL (all year). I still haven't put my summer vehicle away yet (I will be at the beginning of Nov), and I have notice on the cooler mornings around freezing lately that the car with the 15W40 seems to take about twice as long to heat up verses the other car with the 0W30. Both these engines are identical, and have identical cooling systems.
Patman:
I don't think it will show up on the shelves of Wal Mart or CTC anytime soon. Like I said, I had to go to the local Pennzoil dealer to get some and even then the guy had to look it up in the book (he had know idea what it was). The stuff I got is still the older SJ/CG-4 formulation. Seems to be pretty good stuff though: uses a significant amount of PAO, has the good HD LL additive package, and has a 11.8 CST viscosty at 100*C while a pour point of -51*C. This stuff has better cold weather specs than any of Pennzoils full synthetics.