If you want a PAO oil, then Mobil 1 is about the only easily available PAO synthetic out there.
I personally think the Rotella Syn would be a good choice. If AutoRx says to use conventional oil for the next change after you dump the AutoRx, I'd use the Formula Shell 10w30 (available at Advance Auto for around $1.00 a quart) and then switch to the Rotella Syn when you change again.
If you're going with Mobil 1, use Mobil Drive Clean 10w30 after you dump the AutoRx and then switch to the Mobil 1 at the next change.
[ December 10, 2002, 06:54 PM: Message edited by: XHVI ]