I switched to Amsoil 5W30, and sent a sample of the first change of Amsoil to Blackstone Labs.
See the report here, post #246:
http://www.clubtitan.org/forums/show...p?t=43&page=25 (http://www.clubtitan.org/forums/showthread.php?t=43&page=25)

Nice info I being using amsoil for all my cars...