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I presently have the Evans waterless coolant in my 912 and am considering changing to a 50/50 glycol so that the engine will run cooler. Has anyone performed this conversion?
  • Re: Coolant

    by » 13 years ago


    Hi Greg,

    Drain the Evans and while the system is open at a low point blow hard down through the coolant tank on top of the engine. That will just about clear the entire system out. Cover the low point with a rag. It can be messy otherwise. Dump the coolant reservoir. Then fill it up with what ever coolant you are going to use. It simple. It's a little more involved going the other way, but going back to 50/50 is easy. No purging of the coolant like the oil. just fill it up.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: Coolant

    by » 13 years ago


    I have been told that it is not advisable to mix brands of anti freeze in the coolant water. Does anyone have any thoughts on this?

  • Re: Coolant

    by » 13 years ago


    A few simple rules of thumb:
    You can not mix a Dex Cool anti freeze with a non compatible Dex Cool anti freeze. It could thicken where it is not usable. Noted on some anti freeze containers is printed Dex Cool compatible. Still don't mix, but if you had a little residual when swapping coolant it shouldn't be an issue and for those engines that use Dex Cool type coolants it should be okay to use that coolant..
    If you use Evans you only add or top of with Evans and absolutely no water as it is waterless.
    If you use some of the other anti freeze products technically some could be mixed without adverse effects, but it isn't advisable.
    You are always better served when using a 50/50 mix to always best top off with either distilled water or the same product that is in the cooling system. It doesn't matter if you use a standard time limited or extended life anti freeze because you should drain and refill every 2 years. It usually only takes approximately 2/3 gal.

    Draining and refilling a Rotax cooling system is fairly easy and just takes about 15-20 minutes. No one should be penny pinching about spending $12-$15 for a gallon of coolant every couple of years.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


    Thank you said by: Ralph iRMT Sneer

  • Re: Coolant

    by » 3 months ago


    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?


  • Re: Coolant

    by » 3 months ago


    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


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