22213 Sta-Bil Gas Stabilizer 1 Gal

What It Is

The 22213 Sta-Bil Gas Stabilizer (1 gallon) is a fuel additive that prevents ethanol-related corrosion, gum, and varnish in small engines during storage. It’s designed for lawn mowers, tractors, trimmers, and any 2- or 4-cycle engine that sits unused for 30 days or more.

Fitment & Compatibility

This is a universal additive—no deck size, brand, or model restrictions. It works with all gasoline engines (including E10 ethanol blends). Before buying, confirm your fuel system is standard gasoline (not diesel or oil mix). For 4-cycle mowers, pour directly into the gas tank. For 2-cycle equipment, mix with oil and gas per your engine’s ratio. No OEM or aftermarket fitment issues—it’s a chemical, not a mechanical part.

Key Things to Know

• Treatment rate: 1 gallon treats up to 320 gallons of fuel (1 oz per 2.5 gallons). For a typical 1–2 gallon mower tank, you’ll use ~0.4–0.8 oz per fill—this bottle lasts years for most homeowners.
• Storage life: Unopened, shelf life is about 3 years. Once opened, keep the cap tight to avoid moisture contamination. Mark the date with a permanent marker.
• Installation difficulty: Trivial—just pour into the tank before filling with gas, or add directly to stored fuel. No mixing or tools needed. Common gotcha: don’t overfill the tank; leave room for expansion.
• Ethanol protection: This stabilizer contains a biocide that kills ethanol-attracted microbes, which can clog carburetors. It won’t remove existing deposits—use it fresh.

Should You Buy It

Buy this if you own multiple small engines (mower, trimmer, snowblower) and want to prevent seasonal gumming without worrying about ethanol damage. The 1-gallon size is overkill for a single mower—consider the 8 oz or 16 oz bottle instead unless you’re treating 50+ gallons of fuel annually. It’s a solid, no-brainer purchase for storage prep.