The Red Armor oil is the best I use it with 93 octane pure gas, I never use ethanol gas. Once I was educated on this I have never had issues with my chainsaws or weedeaters even after no use for several months, each operates without difficulty.
I have Shindaiwa chainsaw and weedeater along with Ryobi and Husqvarna. All my 2 cycle equipment runs at peak performance.