STA-BIL FUEL STABILIZER (4 OZ), Manufacturer: GOLD EAGLE, Manufacturer Part Number: 22204-AD, Stock Photo - Actual parts

What It Is

STA-BIL Fuel Stabilizer (22204-AD) is a fuel additive that prevents ethanol-related corrosion, gum, and varnish buildup in lawn mower, tractor, and small engine fuel systems during storage (up to 24 months). It’s designed for 4-cycle and 2-cycle engines using gasoline with up to 15% ethanol.

Fitment & Compatibility

• No physical fitment – this is a liquid additive, not a mechanical part. No deck size, model, or brand restrictions.
• Works with any gasoline-powered lawn mower, riding mower, string trimmer, chainsaw, or generator.
• Check fuel type – For ethanol-free gas, use STA-BIL 360 Protection; for ethanol blends (E10, E15), this standard formula is correct.
• Dosage – 1 oz treats 2.5 gallons of fuel. The 4 oz bottle treats 10 gallons. Measure accurately; over-treating won’t harm, under-treating reduces effectiveness.

Key Things to Know

• Quality – Industry standard for over 60 years; rated 4.7/5. Prevents phase separation in ethanol-blended fuels, which clogs carburetors.
• Installation – Pour directly into fuel tank or a gas can before filling. No mixing or tools required. Best added when fuel is fresh.
• Common gotcha – Does not stabilize fuel already gummed or varnished. Use it before storage, not as a cleaner. For existing deposits, use STA-BIL Ethanol Treatment or carburetor cleaner.
• Shelf life – Opened bottle lasts 2 years if sealed tightly. Store in a cool, dry place.

Should You Buy It

Buy this if you store your mower for more than 30 days (especially over winter) and use ethanol-blended gas. It’s a cheap, proven way to avoid carburetor rebuilds and hard starts next season. Skip it only if you always run ethanol-free fuel or drain the tank completely before storage.