I think you are "better off" with a syn at those temps; whether you "must have" a syn is another story. Is the vehicle garaged? How often does it get below -25ºF? How often do you want to change your oil? Since you drive it for 10-20 miles at a time (at least that is the way I intepreted your comments) you eliminate some of the problems you might encounter in winter conditions. If it is garaged, doesn't get below -25ºF very often and you plan to change it at 3mo/3000, you can probably do OK with dino 5W30. I would use the best dino you can find, however, in which category I would put Chevron Supreme, Pennzoil or Formula Shell.
[ September 15, 2003, 06:24 PM: Message edited by: pscholte ]