though there's several options out there...if you're just looking for a general all around coolant, then any 50-50 mix of water/antifreeze that's certified to protect aluminum, will work just fine...such as Peak, or Prestone which is what I run in my 250.
I run Zip-Ty in my 500 to prevent boil over, because they run rather hot in nature...and I have a bottle of Royal Purple-Purple Ice that I haven't had the chance to try yet.