If you are on some stringent 6 month oil change regime then sure. If you only drive say 2000 miles over the winter for some reason are you still going to change the oil out to the "summer grade"? The 5W-30 is going to work fine year round, so if there is some reason you can't do an oil change to 5W-20 for the winter, it's not going to hurt anything to just run 5W-30 all year round. For me, it would be a complete hassle and a waste of oil to do low mileage OCIs just to switch grades for winter and summer use. How cold does it typically get in AL ?Why not if it's being changed anyway? That's what I'm asking.