Ethanol Shield

What It Is

Ethanol Shield is a fuel stabilizer and treatment additive designed to protect small engines (lawn mowers, trimmers, chainsaws) from ethanol-related damage. It prevents corrosion, phase separation, and gum buildup in fuel systems during storage or infrequent use.

Fitment & Compatibility

Check your fuel type: Ethanol Shield works with gasoline containing up to 15% ethanol (E10/E15). It’s compatible with all 2-cycle and 4-cycle engines, including those from Briggs & Stratton, Honda, Kawasaki, Toro, and Husqvarna. No deck size or model-specific fitment—just add to fresh fuel per the label. If your mower uses pure gas or ethanol-free fuel, this is unnecessary.

Key Things to Know

• Quality: 4.4/5 stars from 40 reviews—users report fewer carburetor issues and easier starts after storage.
• Installation: Dead simple—pour the recommended amount (typically 1 oz per 2.5 gallons) into your gas tank before filling. No tools or disassembly needed.
• Gotcha: Must be added to fresh fuel, not old gas. Doesn’t fix already-damaged fuel systems; use it preventatively.
• Storage tip: Run the engine for 5 minutes after adding to circulate it through the carburetor.

Should You Buy It

Buy it if you store your mower for 30+ days, use ethanol-blended gas, or want to avoid costly carburetor repairs. Skip it if you always use ethanol-free fuel or drain your tank between uses.