Marine Formula Fuel Stabilizer, 1-Gal.

What It Is

This is a 1-gallon container of marine-grade fuel stabilizer designed to prevent ethanol-related fuel degradation, corrosion, and gum/varnish buildup in small engines. It’s intended for use in lawn mowers, tractors, and other outdoor power equipment that burns gasoline, especially during off-season storage.

Fitment & Compatibility

• Works with any gasoline engine – no specific brand or model restrictions. Compatible with all 2-cycle and 4-cycle lawn mowers, zero-turn mowers, riding tractors, trimmers, and blowers.
• Check your fuel type – formulated for ethanol-blended (E10) and non-ethanol gas. Not for use with diesel or oil-mix fuel (though it can be added to pre-mixed 2-cycle gas).
• No deck size or OEM part number – this is a universal additive, not a mechanical part. Simply add to fresh fuel before storage.
• Measurement required – 1 gallon treats up to 2,560 gallons of fuel (1 oz per 20 gallons). For most mowers (1–5 gallon tanks), you’ll use a tiny fraction of the bottle. Consider if a smaller size is more practical.

Key Things to Know

• Quality concerns – Only 2 reviews with a 3.5 average; some users report it doesn’t stabilize as long as claimed (often 12–24 months). For critical storage, consider a stabilizer with more positive feedback.
• Installation is easy – Just pour the recommended amount into the fuel tank or a gas can before filling. No tools or mechanical skill needed.
• Marine formula is overkill for most mowers – Marine stabilizers are designed for high-moisture, salt-air environments. For a typical garage-stored mower, a standard automotive stabilizer works fine and costs less.
• Shelf life of the bottle – Once opened, the stabilizer itself degrades. Use within 1–2 years for best results. A 1-gallon jug is a multi-year supply for most homeowners.

Should You Buy It

Only buy this if you frequently store multiple engines (e.g., fleet of mowers, boats, and generators) and need a bulk supply of marine-grade protection for humid or coastal conditions. For a single mower stored in a dry shed, a 4-ounce bottle of standard fuel stabilizer ($5–10) is more practical and cost-effective.