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Ok, so with the move to E15 MOGAS in the US this summer, does anyone know Rotax’ position on its use?  Rotax currently says:

Fuels that contain more than 10% ethanol blend have not been tested by BRP-Rotax and are not permitted for use.“

This prohibition would present obvious challenges for some of us.  Thoughts?

  • Re: E15 MOGAS

    by » 3 months ago


    The way I understand this is the only thing new here is that E15 will now be allowed in the summer months.  E15 has been allowed for quite some time in the winter months in most states, but nevertheless most of the fuel sold in the US is E10, which is a decision of the individual oil companies.  I read that E15 is currently only available in 2300 stations across the US.  I don’t think this new ruling will cause the companies now selling E10 to go to E15 since they have decided against that in the past.  I think what will happen is that the stations currently selling E15 will possibly now sell it in the summer as well as winter.  


  • Re: E15 MOGAS

    by » 3 months ago


    E10 was all Rotax tested and gave their blessing on, but several countries in the world use double that without any issues. Engine's have been disassembled to check on the higher ethanol concentrations and have not had any issues. If you already use an E10 then E15 shouldn't be an issue. Hoses haven't been an issue because if they were all our autos would be sitting on the side of the road.

    Plus I have two friends that test every single batch of fuel they get for the concentration of ethanol. Here in Arizona we use 10% ethanol. For the last 15 years of testing every batch of fuel has been at 6% - 7%  and only a batch or two went to 8%. Bottom line is if your fuel says E15 then test it. It's a very good chance it isn't actually at 15%. Most places say up to 10% or up to 15%. You can buy a very inexpensive test kit that's very easy to use.


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


  • Re: E15 MOGAS

    by » 3 months ago


    Thanks for the suggestion, Roger.  I will do just that.


  • Re: E15 MOGAS

    by » 3 months ago


    You probably have everything laying around your shop to make  your own tester! I made one in about 3 minutes from a glass rain gauge cylinder I had around (constant cross section is required if you don't want to have to figure out the non-linear spacing on a drafted cylinder). 

    A quick Google search will aim you in the right direction if you are so inclined, else certainly nothing wrong with just buying a graduated bottle.

    You could also use your fuel sump tester...

    Cheers!


  • Re: E15 MOGAS

    by » 3 months ago



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


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