STA-BIL Fuel Stabilizer 4 Pack of 16 oz.

What It Is

STA-BIL Fuel Stabilizer (4-pack of 16 oz. bottles) keeps gasoline fresh in lawn mowers, tractors, and other small engines during storage or infrequent use. Each bottle treats up to 40 gallons of fuel, preventing varnish, gum, and corrosion.

Fitment & Compatibility

No physical fitment issues—this is a liquid additive, not a part. Works with any gasoline engine (2-cycle, 4-cycle, ethanol-blended, or pure gas). Check your mower’s fuel tank capacity: 1 oz. per 2.5 gallons. For 4-pack use, ensure total fuel volume across stored machines is under 160 gallons. Not compatible with diesel or two-stroke oil mixes (use STA-BIL 2-Cycle Stabilizer instead).

Key Things to Know

• Quality: Proven formula—prevents ethanol-related water absorption and fuel degradation for up to 24 months.
• Installation difficulty: Extremely easy—pour directly into tank or fuel can before filling. No tools or disassembly needed.
• Common gotchas:
  • Add BEFORE filling with fresh gas, not after.
  • Shake bottle well—settles over time.
  • Treat stored fuel immediately; old, already-stale gas won’t be restored.
• Value: 4-pack is cost-effective for multiple machines or large tanks but overkill for a single push mower (buy one 16 oz. bottle).

Should You Buy It

Buy if you own 2+ small engines (mower, trimmer, generator) and store them for winter or irregular use. It’s a no-brainer for ethanol gas protection. Skip if you only have one mower used year-round—a single 16 oz. bottle is cheaper and sufficient.