Ethanol Shield

What It Is

Ethanol Shield is a fuel stabilizer and ethanol treatment additive designed to prevent corrosion, gumming, and phase separation in small engines (lawn mowers, trimmers, chainsaws, generators) that use ethanol-blended gasoline. It’s for any gas-powered outdoor power equipment, especially seasonal-use machines stored for 30+ days.

Fitment & Compatibility

• Works with any gasoline engine – no specific brand or model restrictions. Use with ethanol blends up to E15 (and some E10/E0 fuels).
• Check your fuel type – not designed for diesel or two-stroke oil premix (though safe for premix if added to the gas before mixing).
• No deck size or OEM vs aftermarket restrictions – universal additive, not a physical part.
• Measurement – 1 oz treats 2.5 gallons of gas. Bottle is 32 oz (treats up to 80 gallons). Use the included measuring cap.

Key Things to Know

• Quality – Contains corrosion inhibitors and a biocide to kill microbes in stored fuel. Higher concentration than many budget stabilizers.
• Installation – Easy: pour into gas can or tank before filling. No tools or disassembly. Shake can after adding.
• Common gotchas – Won’t fix already-damaged fuel systems; use it on fresh gas. For long storage (6+ months), you still need to run the engine to circulate treated fuel. Not a substitute for draining the carburetor if you let gas sit for a year.
• Shelf life – Unopened bottle lasts 3+ years; opened, use within 2 years.

Should You Buy It

Yes, if you own any small engine that sits unused for weeks or months, especially in humid climates or with ethanol fuel. It’s overkill for daily-use mowers, but excellent for seasonal storage, preventing carburetor rebuilds. At $79.95 it’s pricier than basic stabilizers, but the higher concentration means fewer refills and better long-term protection.