Coolant

Is there a recommended Dex Cool?  I just purchased a Rans S6  with a 912 ULS and I do not know what coolant is in the system.  How do I properly drain the old.  I am thinking of putting in the Dex 50/50?

Hi all

Dex-Cool is a trademark (currently owned by GM) If the label says it is Dex then they are all the same.  The only option is concentrate or premix.  I prefer premix as any residual when you use it is already mixed correctly.  No guesswork required.  So Prestone Dex Cool, Caterpillar Dex Cool, Zerex Dex Cool, they are all the same formula.  Dex Cool is what is called an OAT coolant, organic acid technology.  There are currently other extended life coolants that have trace elements added and these are HOAT, hybrid organic acid technology, they normally are the rainbow colored ones from people like BMW, blue or pink, VW, neon, and the list goes on.  

Best rule of thumb, must be the exact same formula and color.  We are not chemists and can't rely on a label that brags about how you can mix it with anything.  I doubt those claims and your engine costs as much as a small car, why risk it. 

Cheers

I did a quick search for those who want to know about OAT and HOAT. (and yes today there is even an SHOAT, another story)  It is automotive based but the problems in a Rotax are almost non-existent.  We don't have the crap materials that had given so many issues in the auto industry.  Today almost nobody uses the old iAT fluids with silic and phosphates (the 24 month stuff) https://www.youtube.com/watch?v=GvuIc1a4aQY