Sta-Bil Ethanol Treatment 10 Oz.

What It Is

Sta-Bil Ethanol Treatment (10 oz.) is a fuel stabilizer and ethanol neutralizer designed to prevent corrosion, gum, and varnish buildup in small engines. It’s for lawn mowers, tractors, trimmers, chainsaws, and any outdoor power equipment that runs on ethanol-blended gasoline.

Fitment & Compatibility

No mechanical fitment—this is a liquid additive. Works with any gasoline engine that uses up to E10 (10% ethanol) fuel. Treats up to 20 gallons of gas per 10 oz. bottle. Not compatible with E15 or higher blends, diesel, or two-stroke oil mixtures (though it can be added to pre-mixed fuel). Check your owner’s manual for fuel recommendations—most modern mowers accept it, but older engines with rubber fuel lines may need confirmation.

Key Things to Know

• Quality: Proven formula—reduces ethanol-related moisture absorption and phase separation. Rated 4.8/5, users report long-term storage success (6–12 months).
• Installation: Easy—just pour directly into gas tank before filling. No tools needed. Shake bottle before use.
• Common gotcha: Over-treating won’t hurt, but under-treating (less than 1 oz. per 2.5 gallons) reduces effectiveness. Use the full dose for best results.
• Storage tip: Add stabilizer to fresh gas, then run engine for 5 minutes to circulate it through the carburetor before storing.

Should You Buy It

Yes, if you store your mower for more than 30 days or use ethanol gas regularly. It’s ideal for seasonal equipment owners who want to avoid carburetor cleaning and fuel system repairs. Skip it if you always use ethanol-free gas or drain fuel completely for storage.