Use 98 & you shouldn't have a problem. (although after reading this post maybe not
http://www.ft86club.com/forums/showthread.php?t=13827 )
Back on topic, I'd stick with 0w-20 or 5w-30 to avoid any warranty issues. If you want extra protection use Amsoil, Redline or Motul.
http://www.ft86club.com/forums/showt...213#post392213