Very likely, since it can also handle 100LL and other fuels and this one is supposed to be a direct replacement 100LL.
But I guess to be safe we'll have to wait for a service letter from Rotax that says as much.
Very likely, since it can also handle 100LL and other fuels and this one is supposed to be a direct replacement 100LL.
Yes, it can use unleaded mogas 91AKI or better with up to 10% ethanol. There is no increase oil change interval associated with unleaded mogas. The increased oil change interval is when using leaded fuel (e.g. 100LL) more than 30% of operation.
Skepilot wrote: ↑Wed Mar 23, 2022 7:56 amYes, it can use unleaded mogas 91AKI or better with up to 10% ethanol. There is no increase oil change interval associated with unleaded mogas. The increased oil change interval is when using leaded fuel (e.g. 100LL) more than 30% of operation.
Downsides with ethanol:
1.) Decreased lifespan of rubber fuel lines. This can be addressed by using aluminum or teflon fuel lines. I used teflon in my TSi.
2.) Shelf life of mogas with ethanol is about half that of ethanol free mogas.
3.) Mogas with Ethanol has lower vapor pressure, which could cause vapor lock or low fuel pressure, especially on hot days or at high altitudes.
All that said, I understand N135WT uses 91 mogas with 10% ethanol all the time with no problems, including many hours at 17,500' and that one run up to 27,000'. (They used 100LL for the run up to 30,000'.)
On my plane, I have noticed slightly lower fuel pressures when flying in the high teens using even ethanol-free mogas. Sometimes I've had to keep both fuel pumps on to maintain fuel pressure in the green, whereas one pump will suffice with 100LL.
Another issue is using winter blend mogas in the spring/summer. Winter blend has lower vapor pressure and can be a problem in warm temperatures and/or high altitudes. This issue remains with or without ethanol, but ethanol makes it worse. Fuel suppliers must change to summer blend by May 1, but retailers have until June 1 to switch over to summer blend. They make the switch back to winter blend around September 15.