Ethanol Shield

What It Is

Ethanol Shield is a fuel stabilizer and treatment designed to prevent ethanol-related damage in small engines (lawn mowers, trimmers, chainsaws, snow blowers). It neutralizes ethanol’s corrosive effects, prevents phase separation, and keeps fuel fresh for up to 12 months.

Fitment & Compatibility

• Engine types: Works with any 2-cycle or 4-cycle small engine that uses ethanol-blended gasoline (E10 or E15).
• Fuel systems: Compatible with carbureted and fuel-injected engines; safe for all seals, gaskets, and fuel lines.
• No deck size or brand restrictions: Use with any mower brand (Honda, Briggs & Stratton, Kohler, Kawasaki, Toro, John Deere, etc.).
• What to check: Verify your fuel is ethanol-blended (check pump label). If you run pure non-ethanol gas, Ethanol Shield is unnecessary. For storage, treat fuel before filling the tank—do not add to empty tanks.

Key Things to Know

• Quality: Highly rated (4.8/5) for preventing gum, varnish, and corrosion in stored engines. Users report reliable starts after winter storage.
• Installation difficulty: Extremely easy—just pour the recommended amount (1 oz per 2.5 gallons) into your gas can or tank before filling.
• Common gotcha: Over-treating won’t harm the engine but wastes product. Measure carefully. Also, Ethanol Shield does not fix existing clogged carburetors—it’s a preventative, not a cleaner.
• Shelf life: Unopened bottle lasts about 3 years; once opened, use within 2 years for best results.

Should You Buy It

Buy Ethanol Shield if you store your mower for more than 30 days (especially over winter) and use ethanol-blended gas. It’s ideal for anyone tired of gummed-up carbs, hard starts, or fuel system repairs. If you always use ethanol-free gas, skip it—you don’t need it.