I too have seen that board and have seen a lot of people not noticing any difference after the Auto Rx treatment.
Grab a container of Degunk or Penzoil engine flush and flush the system using a cheap filter just before you swap to synthetic.
The instruction are in the other synthetic change thread here:
http://www.automotiveforums.com/vbul...d.php?t=305201
Oh, and use Mobil 1 and not Castrol Syntec.
Castrol Syntec is not a true synthetic. Mobil 1 is.