The mix does not separate. I had a clear bottle with fully syntetic mix standing for month and there was no separation.

At the end of a trackday I usually turn off the petrol and let the engine run untill the carburator is emptied as the carburators could get some gum in them from evaporated petrol leaving the oil behind
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom