Mixing Avgas and Mogas for Subaru Ops

[dunc]

Who does it? Why? Proof?

 

[AirCommandPilot]

Explain? Are you asking if it's possible, preferred, or if it's normally done? I've got a Subaru and would like to know also.

 

[Kolibri]

I use no-Ethanol 92 car gas from my hangar, but if x/c the airports almost always sell only 100LL.
So, a mixture of the two is inevitable if you travel in your gyro.

If you use 100LL in any amount, you should also be using at least a semi-synthetic motor oil, if not a mineral-based oil.
Pure synthetic oil will not capture the lead deposits of 100LL, and will actually sludge up.

That said, I see no value in purposely mixing them, and some possible detriment to doing so.

https://www.rotaxservice.com/rotax_tips/rotax_feed4.htm
https://www.fuelexpert.co.za/canirunavgas.php
https://www.rotax-owner.com/en/rotax-forum/3-4-stroke-technical-questions/4490-risk-of-use-of-full-synthetic-oil-with-100-ll

Tip: use a quality semi-synthetic motor oil, and you won't have to wonder if it's OK with which fuel.

Regards,
Kolibri

 

[dunc]

Thanks for the cited tips, Kolibri. I assume anything good for a 4 stroke Rotax is good for the Soobee too, I may have been given some bum information by well-intentioned experts. Getting quite comfortable now, flying about an hour each day, mostly S&G. Will start practicing aerial maneuvers soon, and having a blast. That cabin heater works pretty well.

 

[L_Butler]

The lead in the aviation fuel will foul your oxygen sensors used by the computer to inject the proper amount of fuel. I have heard of people using TCP to bind with the lead and prevent this from happening, but I don't know if it really works. My subaru has fouled a sensor using avgas. It runs really rich and gas consumption is horrible. It gets worse the higher you go.