No need to buy the special chainsaw stabilizer

Regular automotive fuel stabilizer works fine in a 2-stroke chainsaw mix.

The stabilizer treats the gasoline, not the oil. The active ingredient in the standard Sta-Bil and the “small engine” versions is essentially the same chemistry — it stops the gas from going stale and varnishing up your carburetor. The fact that your gas has 2-stroke oil mixed in doesn’t change how that works. The “2-cycle” or “small engine” stabilizers on the shelf are mostly the same stuff with a splash of fuel system cleaner and a different label.

Where people actually wreck chainsaw storage isn’t the stabilizer brand. It’s leaving ethanol gas in the tank, or letting the mix sit for months. If you want the saw to start next spring, use ethanol-free fuel if you can get it, mix it fresh, add stabilizer, run the saw for a couple minutes so treated fuel reaches the carb, and either drain the tank or leave it full of treated mix. Both approaches work.

The only thing worth paying extra for is ethanol-free gas, not a fancy bottle of stabilizer.