Sta-Bil Ethanol Treatment 10 Oz.

What It Is

This is a fuel stabilizer and ethanol treatment designed to prevent corrosion, gum, and varnish buildup in small engines. Use it in lawn mowers, tractors, trimmers, chainsaws, and any gas-powered outdoor equipment stored for 30+ days.

Fitment & Compatibility

No mechanical fitment—this is a fuel additive. Works with any gasoline engine (2-cycle or 4-cycle) that uses ethanol-blended fuel (E10, E15). One 10 oz. bottle treats up to 40 gallons of fuel (2.5 oz. per 10 gallons). Check your fuel cap or manual for ethanol content; if you use non-ethanol gas, this isn’t needed. For seasonal storage, treat the tank before the last run.

Key Things to Know

• Ethanol protection: Stabilizes fuel for up to 24 months; prevents phase separation and corrosion from ethanol moisture absorption.
• Easy to use: Pour directly into tank or mix with fuel in a can. No tools, no disassembly. Shake bottle before use.
• Storage tip: Run the engine for 5 minutes after adding to circulate treated fuel through the carburetor.
• Common gotcha: Overdosing won’t harm the engine, but it’s wasteful—measure carefully with the bottle’s integrated measuring cup.

Should You Buy It

If you store your mower or other gas equipment for winter or long periods, this is a cheap, effective way to avoid carburetor cleaning and fuel system repairs. Skip it if you always run non-ethanol fuel or empty the tank before storage.