Mogas then 4 months non use

You would have to unclip the the carb bowls and dump the fuel. If it was my plane I would drain all fuel tank included rather than let it sit with car gas for 4 months, it may no longer be safe to run in the Rotax 912. Brain Carpenter from Rainbow Aviation recently penned a couple of articles in EAA's Sport magazine (under technically Speaking) a few months ago in regards to the differences of 100LL and mogas in the Rotax 912. I have switched to the new SWIFT fuel a 100LL replacement with excellent results.

Thanks so much - I might just drain the mogas and use 100ll with decalin for the first time.  I did read those excellent articles

i think, from mogas to 100LL, YOU have change engine oil.

with 100 LL , AERO SHELL PLUS always USE.

姓, xìng wang wrote:

i think, from mogas to 100LL, YOU have change engine oil.

with 100 LL , AERO SHELL PLUS always USE.

I believe that should have stated that Aero Shell Plus 4 is the recommended engine oil for use with 100LL.  That's the Rotax recommendation in SI-912-016 R10 (paragraph 3.3 on page 5 of 13).

People hangar their aircraft over the winter all the time.

Mogas is not going to turn to jello if it sits in an enclosed tank for a few months.

Ideally, drain it below a half tank and then fill it up with fresh gas and then go fly, you'll never know the difference.