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Yout generator likely got condensate in the fuel, which regular Sta-Bil is not designed to deal with.
Marine Sta-bil protects against moisture, but costs considerably more, and is not good for very long storage.
Actually, all of the additives use the same ingredients, regardless of brand, but the proportions will vary.
API has much info available about petroleum product storage at no cost.
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Go to Ethanol Shield’s site. They have some interesting test papers and info on their products done by independent labs.
For now I’ll stick with what works for me.