Now this may be a dumb question, but it's something that has always made me wonder. I get it that the colder environment you're in, the better the idea it is to go down a grade of oil (as in the xW weight). But according to the BITOG Motor Oil University, it says that all oils are too thick at start up, regardless of weight, that the lower the xW of oil you can go, the better. Or that's how at least I interpret it. So using this logic, what's the point of using a, for example, 10w30 oil these days? Wouldn't this logic mean a 5w30 is better on startup, and a 0w20 is more beneficial than a 5w20?Even in a hot environment. So I guess there is a couple factors to consider, either we are trying to avoid shearing of the oil (which I don't know a lot about) or the Motor Oil University here on BITOG is wrong. I understand that this may open a can of worms, but I'd like to understand better. Please share your thoughts, thanks.