There is no BEST motor oil, regardless of what anyone on here will post. There has never been a comprehensive side-by-side analysis of all the major motor oils other than a Consumer Reports aricticle a few years back. Their advice was to get the cheapest dino oil you can find and use it according to your owner's manual. The "benefits" of the synthetic did not justify the additional expense unless you intend on keeping your vehicle for the rest of your life and drive 50k per year.
http://forums.nasioc.com/forums/show...hreadid=389190 for more info.