I’m not sure what you’re using it for but the only things I use any type of 2 cycle oil for are my lawn mower, weed trimmer and chainsaw. I usually just go with a multi-purpose Valvoline 2 cycle engine oil but I usually will just buy the bottles in 1 quart.
I’ve found this website but I don’t think they sell synthetic oil in 2.6 liter bottles but I was thinking of ordering this oil myself just to try it.