It honestly shouldn't do any damage. It would be best to stick with what the factory recommends. Personally, I don't like to use something as thin as 5w-20....but I guess the factory should know what the engine will run best on. I wouldn't worry too much about it unless they try to get you to run 20w-50 or something really ridiculous like that.
good but
5w20
5W20.
4.75qt of oil 5w20
Even if you can it's not a good idea. These oils have different viscosity and might have different chemical content. When you mix the oils it can change their mechanical properties and the oil will not be as good as when they are separate. You can get special additives to tune 5w20 in something in between 5w20 and 5w30.
4.5 quarts 5w20
7 quarts 5w20
5w20
5 quarts usually 5W20 oil.
5w20, does not have to be synthetic.5w20, does not have to be synthetic.
10w30 is thicker than 5w20
Check the oil cap. If its doesn't say, use 5w30If it says 5w20, use 5w20.Check the oil cap. If its doesn't say, use 5w30If it says 5w20, use 5w20.