For quite a few years now I've been using synthetic oil exclusively in my vehicles (various oils including GC 0W30, Mobil 1 HM, Mobil 1 5W30 and now PP or Ultra in my old Honda Accord and Chevy Impala). Looking at the UOA's lately it seems that add packs in the dino oils are pretty impressive and are giving great results (including the new SN oils). I'm seriously considering going back to good 'ol dino (thinking PZ yellow bottle with it's impressive specs in the the new SN flavor). These cars see a LOT of easy highway miles (55 mph speed limit here for the most part and few opportunities to do any city driving as there aren't any real cities). My only concern is winter starting. Temps here in the "great white north" trend to subzero much of the time and I like the lower pour points of the synthetics. I just don't think I'm getting that much advantage for my type of driving from these synthetics.