I've used Startron in my Shamrock boat ( inboard 302Ford ), 'cause it sits quite a bit, the same with my 77 F250 4X4 Highboy.
I can also say that I have , on several occasions, drained the 2cycle mix out of backpacks that have been sitting in the shop for like two months or more waitin' on parts, and used it in the unit I was working on, and had no problems, started right up, and ran great. No evidence of "phase separation" etc. with the old mix.
In fact, the two cycle mixed fuel is mixed and stored in like a couple hundred gallon tank! Sittin' outside, covered in snow as I type. Very little use this time of year. I don't know what brand oil they use, but I'll find out Monday.