I agree 5W-20 is what you want. You don't want to exceed 20 weight, as that is the weight the oil becomes when hot. So unless you live in a part of the country with extreme cold temps, 5W-20 is fine. Your car will not suffer from using 5W over 0W, as this is the weight the oil is when cold. Once the engine starts the temp changes the oil rather quickly past 0W.