Best Fuel Stabilizer (2026): 5 Compared
Fuel stabilizers compared by size, dosing rate, storage length and warranty, for cars, boats, mowers and generators.
On this page
Top picks at a glance
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- 1
Best for StorageSTA-BIL Storage 8 oz9.6/10View on Amazon - 2
Best Bulk PackLucas Fuel Stabilizer9.6/10View on Amazon - 3
Best for OutboardsYamalube Stabilizer9.6/10View on Amazon - 4
Best Small BottleSTA-BIL 4 oz9.3/10View on Amazon
The mower sits all winter with gas in the tank, and the boat waits for spring with fuel in the line. Fuel turns stale in storage, and the best fuel stabilizer is the bottle that keeps it fresh until the engine turns over again. This guide compares the fuel stabilizers below by size, dosing rate, storage length and warranty.
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Quick picks
- Best for Storage STA-BIL Storage 8 oz: Keeps gasoline fresh up to 24 months, dosed at 1 oz for every 2.5 gallons, with a stated 5-minute run after adding. Check price on Amazon
- Best Bulk Pack Lucas Fuel Stabilizer: 12 bottles of 15 oz, dosed at 1 oz per 1 gallon, for all gasoline grades and 2 and 4 cycle engines. Check price on Amazon
- Best for Outboards Yamalube Stabilizer: Alcohol-free formula for E10 fuels that keeps fuel fresh up to a year, with a corrosion inhibitor. Check price on Amazon
- Best Small Bottle STA-BIL 4 oz: A 4 oz STA-BIL bottle, the smallest size here, from Gold Eagle. Check price on Amazon
Picks for the garage
STA-BIL Storage Fuel Stabilizer, 32 oz
A 32 oz storage stabilizer that treats 80 gallons and keeps gasoline fresh for up to 24 months, with directions to run the engine for 5 minutes after adding.
Pros
- Treats 80 gallons from a 32 oz bottle
- Keeps gasoline fresh for up to 24 months in storage
- Protects against corrosion and ethanol damage
- Clear directions: 1 oz per 2.5 gallons, then run the engine for 5 minutes
Cons
- Bottle size is 32 oz, larger than the 8 oz Star Tron bottle
- Product expires 2 years from opening, per the listing
- Must be added before gasoline, per the directions
- Needs the engine run for 5 minutes after adding, per the directions
STA-BIL Storage Fuel Stabilizer, 8 oz
An 8 oz bottle of STA-BIL Storage fuel stabilizer that keeps gasoline fresh for up to 24 months, dosed at 1 oz for every 2.5 gallons of gas.
Pros
- Keeps gasoline fresh for up to 24 months during storage
- 1 oz treats 2.5 gallons, a clear dosing rate
- Protects against corrosion and ethanol damage per the listing
- Pour into the tank before adding gasoline, then run the engine 5 minutes
Cons
- No concrete warranty term stated, only a satisfaction guarantee
- No safety listing stated
- Bottle expires 2 years from opening
- Dosing needs measuring, 1 oz per 2.5 gallons
Lucas Oil 10302-12 Fuel Stabilizer (12x15oz)
A pack of 12 bottles of 15 oz Lucas Oil fuel stabilizer, dosed at 1 oz per 1 gallon, for all grades of gasoline and 2 and 4 cycle engines.
Pros
- 12 bottles of 15 oz in a pack
- 1 oz treats 1 gallon, a clear dosing rate
- Safe for all grades of gasoline and 2 and 4 cycle engines per the listing
- Prevents gasoline break-down during storage per the listing
Cons
- No storage length stated
- No warranty term stated
- No safety listing stated
- Pack weighs 11.7 lb
Yamaha Yamalube Outboard Fuel Stabilizer
A 12 oz bottle of Yamaha Yamalube outboard fuel stabilizer and conditioner, an alcohol-free formula for E10 fuels that keeps fuel fresh up to a year of storage.
Pros
- Alcohol-free formula for E10 fuels
- Keeps fuel fresh up to a year of storage
- Metal filmers protect steel and aluminum components per the listing
- Prevents carburetor icing and gas line freeze per the listing
Cons
- No dosing rate stated
- No warranty term stated
- No safety listing stated
- No weight stated
STA-BIL FUEL STABILIZER (4 OZ), Manufacturer
A 4 oz bottle of STA-BIL fuel stabilizer from Gold Eagle, part number 22204-AD.
Pros
- 4 oz bottle, the smallest size here
- STA-BIL brand from Gold Eagle
- Manufacturer part number 22204-AD stated
- Title notes the stock photo shows the actual part
Cons
- No dosing rate stated
- No storage length stated
- No warranty term stated
- No corrosion or ethanol claim stated
Compared on paper
| Model | Shop Score | Size | Dosing | Storage | Corrosion | Warranty |
|---|---|---|---|---|---|---|
| STA-BIL Storage 8 oz | 9.6/10 | 8 oz | 1 oz per 2.5 gallons | Up to 24 months | Stated | Not stated |
| Lucas Fuel Stabilizer | 9.6/10 | 12 x 15 oz | 1 oz per 1 gallon | Not stated | Not stated | Not stated |
| Yamalube Stabilizer | 9.6/10 | 12 oz | Not stated | Up to a year | Stated | Not stated |
| STA-BIL 4 oz | 9.3/10 | 4 oz | Not stated | Not stated | Not stated | Not stated |
| STA-BIL Storage 32 oz | 9.7/10 | 32 oz | Not stated | Up to 24 months | Stated | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 3 November 2026.
How the points were given
Each stabilizer is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. None states a safety listing, so no safety score is awarded, and none states a warranty term with a concrete term.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| STA-BIL Storage 8 oz | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Lucas Fuel Stabilizer | 9.6 | 29 | 20 | 20 | n/a | 0 |
| Yamalube Stabilizer | 9.6 | 28 | 20 | 20 | n/a | 0 |
| STA-BIL 4 oz | 9.3 | 23 | 18 | 16 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
What the listings tell you
We read 5 fuel stabilizer listings. Only 2 stated a dosing rate, 2 stated a storage length, and 1 stated a weight. None stated a safety listing or a warranty term with a concrete term. The 32 oz listing is title only, and the 4 oz listing gives only a size.
Buying guide: the best fuel stabilizer for your garage
Storage length
Storage length is the headline figure. The STA-BIL 8 oz and 32 oz listings state up to 24 months, and the Yamaha listing states up to a year. Match the length to the time the fuel sits, and check the expiration on the bottle: the STA-BIL 8 oz listing gives 2 years from opening and 5 years from production. A bottle that sits on the shelf past its expiration is a bottle to replace, not to pour.
Dosing rate
Dosing decides how far a bottle goes. The STA-BIL 8 oz listing states 1 oz for every 2.5 gallons, and the Lucas listing states 1 oz to treat 1 gallon. The Yamaha, 4 oz and 32 oz listings state no dosing rate. Measure by the rate on the bottle you buy, and pour it into the fuel tank before adding gasoline. A rate that is missing from the listing leaves the dose up to the bottle, so check the label when it arrives.
Size and pack
Size runs from a 4 oz bottle to a 32 oz bottle, with a pack of 12 bottles of 15 oz in between. A small bottle suits a small tank, and a large bottle or a pack suits a shop that treats fuel often. The Lucas pack weighs 11.7 lb, so it takes real shelf space, while the STA-BIL 8 oz bottle weighs 0.51 lb and fits in a drawer.
Storage and safety
The STA-BIL listing directs you to pour the stabilizer into the fuel tank before adding gasoline, then run the engine for 5 minutes to treat the entire fuel system. Do that in open air, not in a closed garage. Keep fuel away from sparks and open flame, and store the bottle upright on a shelf.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
FAQ: garage tools
What is a fuel stabilizer?
A fuel stabilizer is an additive that keeps gasoline fresh during storage and helps protect the fuel system against corrosion and ethanol damage, per the STA-BIL listing. You pour it into the fuel tank before adding gasoline, then run the engine for 5 minutes to treat the entire fuel system.
What is the best fuel stabilizer for boats?
The STA-BIL 8 oz listing names boats among its uses, along with vehicles that are not in use and outdoor power equipment during winter months. The Yamaha listing is an outboard fuel stabilizer and conditioner for E10 fuels, so it is the pick aimed at boat engines.
How much fuel stabilizer for 5 gallons?
The listings state different rates, so check the rate on the bottle you buy. The STA-BIL 8 oz listing states 1 oz for every 2.5 gallons of gas, and the Lucas listing states 1 oz to treat 1 gallon.
Can fuel stabilizer fix old gas?
None of the listings here states that it fixes old gas. The listings describe keeping fuel fresh during storage and preventing gasoline break-down, not restoring fuel that has already gone stale. Treat fresh fuel before storage, not after. Store fuel with stabilizer from the start, and the engine turns over when the season starts.
How to use fuel stabilizer for a generator?
Follow the rate on the bottle you buy. The STA-BIL listing directs you to pour the stabilizer into the fuel tank before adding gasoline, then run the engine for 5 minutes to treat the entire fuel system. Do that in open air, not in a closed garage.
Related: the best motor oil, the best engine flush for motorcycles, our engine and shop equipment hub and our garage safety notes. Also see our best fuel injector cleaning kit for motorcycle. Also see our best oil drain valve for lowered cars. Also see our best coolant flush kit for home garage.
