So if you don't have a hobby of making your car engine last for a ridiculously long time and/or mileage, and you don't race it, you are OK with any oil.* If this is the case, why not use the recommended 0W20 blend, which will also save you a couple percent on gas. In the...
I know some recommend Quaker State Ultimate Durability 0W-20 Full Synthetic Motor Oil, which apparently has the lowest kinematic viscosity, if you care about that kind of thing (prob more so on the hypermiling side). If I did my own changes, I'd prob go with that. It even beats out ...