BS. They are not at all standardized. Use VW/ Audi Pentosin , or another product called DexCool if in a pinch. 460 Jetboat
you should stick with whatever antifreeze the manufacturer recommends. Those colors aren't there just for marketing purposes; each one denotes a different chemical composition. If Audi recommends that you use yellow or pink antifreeze (which they do for newer models), then stay with it. Remember also that your cooling system will still cool and lubricate itself with as little as 30 percent antifreeze to water content. If you're a little low and need to top off, you can't go wrong with deionized water.