Originally posted by KC99SE:
so it would be alright to use 0-20w full synthetic for the winter than. I will get some of that then for my next oil change. Thanks everyone for your replies! 
Kevin, not only is it alright to use fully synthetic oil, it is preferable and better for your engine in cold weather. The primary benefit of fully synthetic oils in winter is that they don't thicken as much at low temperatures as dino oil and therefore provide better flow/lubrication at initial startup.
I'd suggest you stick with the 5-30W though as it will be more than slippery enough for anything Detroit will throw at it. That way you don't need to concern yourself with winter versus summer oils and just change at your regular schedules.
I lived in northern British Columbia for awhile, approx. 25 years ago before they had 0-20W or even 5-30W and I ran 10-30W Mobil 1 in my 78 International Scout 4X4 and 69 302 Ford Falcon with good results and that was at minus 50 degrees  
Regards, Alan
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