While Ethanol Shield will not "create" ethanol free fuel from ethanol blended fuel, it will help the engine to run smoothly and keep the fuel fresh in storage for a minimum of a year. The product helps strengthen the bond between the ethanol and gasoline molecules and helps keep water in solution so it can burn through as if it wasn't present, it also rejuvenates plastic and and rubber parts in the fuel system.
Ethanol Shield will stabilize your gas for a minimum of a year. Depending on storage conditions (ie kept in a an uninsulated shed vs an insulated one) and some other factors, it can last longer.
Different functions. I use both.
You need to mix the ethanol shield in your gasoline, then use the treated gasoline to mix with the 2 cycle oil
We recommend 1oz Ethanol Shield per 2.5 gallons of gasoline. We also recommend that you treat the gas can(s) that feed into your equipment to ensure all of your equipment is treated. With that said, you can add it directly to your equipment's fuel tank and you can not over treat with the product. If you add 1 oz to half a gallon there shouldn't be any issues.
I use it for both. Works just fine in lawnmowers, outboards, trimmers, etc.
I do just that for my outboard engine, and for over three years I've had no problems with the engine.
I have a bottle that is over two years old, opened, and no problems so far.