This horse has been whipped to death but, since it's that time of year again, it's time for the poor guy to make his appearance again. I was shopping for some oil at my local Walmart and found Valvoline High Mileage Full Synthetic 0W20 is now an option. My 2008 Commander is equipped with the 4.7 V8, which calls for 5W20. Since it's got upwards of 154,000 I figured I might transition to high mileage oil. Here in North Dakota, it's not unusual to spend several weeks per winter at 0°F down to -30°F. Since I know just enough about oil to be dangerous and have looked for a definitive opinion (which I haven't found) whether I can substitute this oil for the 5W20 called for, I thought I'd bug you guys. I know that it should improve cold temperature flow upon start up, but the same weight at operating temp. I imagine the base oils for this and the 5W20 are of similar quality, so only real drawback I can think of is whether the 0W20 might lead to a small amount of consumption. Since I haven't had this truck long enough to know if it has an issue with consumption or not, I thought I'd give it the benefit of the doubt. Is there any reason I'm overlooking why this 0W20 oil shouldn't be in my truck during winter or year round?