Thanks for taking the time to not only explain it to me but also tell where I can get it. I appreciate it man. I had bought 5 gallons from "Amsoil", should I just return it? Or use that one for now?You can get it at any Ford dealer, parts store, even Walmart sells coolant though I would recommend the Motorcraft brand as that is what came in the truck originally. The mixture is to maintain the correct boil, corrosion and freeze protection and cooling efficiency. As FT1 stated do NOT use tap water, distilled water should be mixed with concentrated coolant if mixing it yourself.