Visit Zerex's website, they give a nice set of information.
You are wise to ask, and investigate on your own.
I have found that the clerks at the auto part stores tend to have no clue about the coolant that they are selling, although they will fill you in on a LOT of mis-information.
Another website would be Peak's.
By reading up at these 2 websites, you can quickly become more knowledgable than most people.