Best Fuel Stabilizer for Winter Storage (2026)
Five fuel stabilizers compared by treat rate, stated storage life, corrosion protection and warranty for winter storage.
On this page
Top picks at a glance
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- 1
Best OverallStar Brite Pro Star9.6/10View on Amazon - 2
Best 24-Month PickSTA-BIL Storage 4 oz9.6/10View on Amazon - 3
Best Bulk BottleSTA-BIL Storage 8 oz9.5/10View on Amazon - 4
Highest Treat RateStar Tron 8 oz9.5/10View on Amazon - 5
Quicksilver Quickstor Fuel Treatment and StabilizerView on Amazon - 6
Premium Fuel StabilizerView on Amazon - 7
Cn Fuel Stabilizer 236Ml Gasoline AdditivesView on Amazon - 8
Fuel StabilizerView on Amazon - 9
HappyFuel Premium Fuel StabilizerView on Amazon
The mowing season ends the same way every year: the last pass, the washdown, and the long sit. A mower that sleeps through winter on untreated fuel wakes up to varnish in the carburetor and a spring that starts with repairs. This guide to the best fuel stabilizer for winter storage compares five stabilizers by treat rate, stated storage life, corrosion claims and warranty, so the fleet starts clean when the grass greens up again.
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Quick picks
- Best Overall Star Brite Pro Star: Stabilizes and fogs in one step, 1 oz per 5 gallons, 30-day refund stated Check price on Amazon
- Best 24-Month Pick STA-BIL Storage 4 oz: Keeps fuel fresh up to 24 months stated, 4 oz treats 10 gallons Check price on Amazon
- Best Bulk Bottle STA-BIL Storage 8 oz: Same 24-month formula in an 8 oz bottle at 1 oz per 2.5 gallons Check price on Amazon
- Highest Treat Rate Star Tron 8 oz: Title states 8 oz treats 128 gallons; spec table says 1 oz treats 6 gallons Check price on Amazon
Our acreage picks
Star Brite Pro Star Gasoline Stabilizer with Corrosion Inhibitors
A gasoline stabilizer with corrosion inhibitors that combines stabilization and fogging in one step, dosed at 1 fl oz per 5 gallons with a 30-day refund stated.
Who it's for: a keeper who wants stabilization and fogging handled together before storage.
Who should skip it: anyone who wants a stated storage life in months, which this listing does not give.
Read the full review
The Pro Star combines stabilization and fogging in one step at 1 fl oz per 5 gallons in the bullets (spec table says 6 gallons; trust the bullets). It states corrosion inhibitors, suits E-10 blends, and lists a 30-day refund.
Pros
- Stabilization and fogging combined in one step, stated
- 1 fl oz per 5 gallons, the leanest dose stated here
- Corrosion inhibitors stated to guard against rust
- 30-day refund stated by the manufacturer
Cons
- No storage life in months is stated
- The spec table says 1 fl oz treats 6 gallons, which conflicts with the 1 oz per 5 gallons in the bullets; trust the bullets
- The bottle size for this ASIN is not stated
- No stated months of freshness like the STA-BIL picks
STA-BIL Storage Fuel Stabilizer, 4 oz, Treats 10 Gallons
A 4 oz bottle that treats 10 gallons, keeps fuel fresh for up to 24 months during storage, and states protection against corrosion and ethanol damage.
Who it's for: a keeper storing one mower and a can of fuel for the winter.
Who should skip it: anyone who wants a stated refund or warranty term.
Read the full review
The 4 oz bottle treats 10 gallons at 1 oz per 2.5 gallons and keeps fuel fresh up to 24 months, with stated corrosion and ethanol protection. Run the engine 5 minutes after adding; it expires 2 years from opening.
Pros
- Keeps fuel fresh for up to 24 months, stated
- 4 oz treats 10 gallons, stated in the title
- States protection against corrosion and ethanol damage
- Clear directions: 1 oz per 2.5 gallons, run the engine 5 minutes
Cons
- No warranty term is stated
- The small bottle suits one or two tanks, not a whole fleet
- Expiration terms add up to 5 years from production, stated, so check the code on the bottle
- The 100% satisfaction statement carries no time limit
STA-BIL Storage Fuel Stabilizer, 8 oz
The same 24-month formula in an 8 oz bottle dosed at 1 oz per 2.5 gallons, with stated protection against corrosion and ethanol damage.
Who it's for: a keeper dosing several tanks across mowers, trimmers and blowers.
Who should skip it: anyone who wants a stated warranty; the listing states a satisfaction policy with no time limit.
Read the full review
The same formula in a bigger bottle: 1 oz per 2.5 gallons, up to 24 months, and stated corrosion and ethanol protection. Weighs 8.2 ounces with the same 5-minute run time.
Pros
- Keeps fuel fresh for up to 24 months, stated
- 8 oz bottle with the same 1 oz per 2.5 gallon dosing
- States protection against corrosion and ethanol damage
- Clear directions: pour before fueling, run the engine 5 minutes
Cons
- No warranty term is stated
- The title states no treat total, only the bottle size
- The 100% satisfaction statement carries no time limit
- The ranking and lab claims in the bullets are the maker’s word
STAR BRITE Star Tron Enzyme Fuel Treatment, 8 oz Concentrated Formula
An 8 oz concentrated enzyme fuel treatment whose title states it treats 128 gallons and works in all engines and all fuels.
Who it's for: a keeper who wants the highest stated treat rate per bottle.
Who should skip it: anyone who wants a stated storage life or a stated warranty.
Read the full review
An 8 oz enzyme treatment the title says treats 128 gallons (spec table says 1 fl oz treats 6 gallons; trust the title). States it works in all engines and all fuels; weighs 8.5 ounces; no storage life stated.
Pros
- Title states 8 oz treats 128 gallons
- States it works in all engines and all fuels
- Concentrated formula in 1, 8, 16 and 32 oz sizes stated
- Weighs 8.5 ounces stated
Cons
- The spec table says 1 fl oz treats 6 gallons, which conflicts with the 128-gallon title; trust the title and bullets
- No storage life in months is stated
- No warranty term is stated
- Directions for winter storage are not stated
Yamaha Yamalube Fuel Stabilizer and Conditioner, 32 Ounce
Yamaha’s 32 oz fuel stabilizer and conditioner, model ACC-FSTAB-PL-32, with no treat rate or storage life stated in the listing.
Who it's for: a keeper who already runs Yamaha equipment and wants the brand’s own bottle.
Who should skip it: anyone who wants stated dosing or a stated storage life.
Read the full review
Yamaha’s 32 oz stabilizer and conditioner, model ACC-FSTAB-PL-32, weighing 2.05 pounds. No treat rate, storage life or directions stated.
Pros
- Largest bottle here at 32 oz stated
- Yamaha’s own stabilizer and conditioner
- Weighs 2.05 pounds stated
- Model ACC-FSTAB-PL-32 clearly stated
Cons
- No treat rate is stated
- No storage life in months is stated
- No directions are stated
- No warranty term is stated
Other machines to compare
Quicksilver Quickstor Fuel Treatment and StabilizerCheck price on Amazon
Premium Fuel StabilizerCheck price on Amazon
Cn Fuel Stabilizer 236Ml Gasoline AdditivesCheck price on Amazon
Fuel StabilizerCheck price on Amazon
HappyFuel Premium Fuel StabilizerCheck price on Amazon
Side-by-side specs
| Model | Acre Score | Bottle size | Treat rate | Storage life stated | Corrosion stated | Warranty |
|---|---|---|---|---|---|---|
| Star Brite Pro Star | 9.6/10 | 1, 8, 16, 32 oz sizes | 1 fl oz per 5 gal | Not stated | Corrosion inhibitors stated | 30-day refund stated |
| STA-BIL Storage 4 oz | 9.6/10 | 4 oz | 1 oz per 2.5 gal | Up to 24 months | Ethanol damage protection stated | Not stated |
| STA-BIL Storage 8 oz | 9.5/10 | 8 oz | 1 oz per 2.5 gal | Up to 24 months | Ethanol damage protection stated | Not stated |
| Star Tron 8 oz | 9.5/10 | 8 oz | 128 gal per title; 6 gal per oz per spec table | Not stated | Not stated | Not stated |
| Yamalube 32 oz | 9.4/10 | 32 oz | Not stated | Not stated | Not stated | Not stated |
Specifications are manufacturer rated as listed, collected 23 October 2026. Dose rates come from the listing title and bullets, which outrank the spec table when they disagree.
Acreage and terrain fit
Star Brite Pro Star
STA-BIL Storage 4 oz
STA-BIL Storage 8 oz
Star Tron 8 oz
Yamalube 32 oz
Buying guide: choosing the best fuel stabilizer for winter storage
The best fuel stabilizer for winter storage in this group depends on the fleet: the picks run from a 4 oz bottle that treats 10 gallons to an 8 oz bottle whose title states 128 gallons.
Treat rate and bottle size
STA-BIL doses 1 oz per 2.5 gallons of gas, so the 4 oz bottle treats 10 gallons stated. The Pro Star doses 1 fl oz per 5 gallons in the bullets, the leanest rate here. Star Tron’s title states 8 oz treats 128 gallons, though its spec table says 1 fl oz treats 6 gallons; trust the title and bullets. The Yamalube listing states no treat rate. For more on the fuel side of storage, see our fuel stabilizer for lawn mowers picks.
How long fuel stays fresh
Both STA-BIL listings state fuel stays fresh for up to 24 months during storage. The other three listings state no storage life, which is the main reason the STA-BIL picks lead this group on performance. See whether to leave gas in a mower over winter for the drain-or-treat call.
Corrosion and ethanol
STA-BIL states protection against corrosion and ethanol damage, and the Pro Star states corrosion inhibitors to guard against rust. The Pro Star also states it suits ethanol blends like E-10 and all other fuel types. The Star Tron and Yamalube listings state nothing about corrosion.
Fogging in one step
The Pro Star combines fuel stabilization and fogging in one step, which no other pick here claims. The STA-BIL listings instead give a run time: add the stabilizer, then run the engine for 5 minutes to treat the whole fuel system.
Storage routine
STA-BIL says to pour the stabilizer into the tank before adding gasoline, then run the engine for 5 minutes. The Pro Star says to add 1 fl oz per 5 gallons, fill the tank, and run the engine for 10 minutes. Dose before the last mow so treated fuel is through the system when the mower goes quiet.
Read the manual, keep children and pets out of the yard while you work, wear eye and hearing protection and sturdy footwear, and never exceed the slope rating of your machine. Refuel only with the engine off and cool. See CPSC lawn mower safety. Read our Safety Disclaimer.
Matching It to Your Property
- A big fleet of mowers, trimmers and blowers: the Pro Star doses 1 oz per 5 gallons, so one bottle stretches across the shed.
- A single rider stored for the season: the STA-BIL 4 oz treats 10 gallons stated, enough for the tank and the fuel can.
- An unheated outbuilding: the Pro Star is stated effective in various climates.
- Boats and vehicles stored next to the mower: the STA-BIL listings name vehicles, boats and outdoor power equipment among their uses.
The Acre Score explained
The Acre Score weighs performance, build, value, safety and warranty. None of these listings states safety features, so every pick scores zero on safety, and only the Pro Star states a warranty term. See How We Pick for the weights.
| Product | Acre Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Star Brite Pro Star | 9.6 | 29 | 20 | 21 | n/a | 2 |
| STA-BIL Storage 4 oz | 9.6 | 29 | 20 | 20 | n/a | 0 |
| STA-BIL Storage 8 oz | 9.5 | 29 | 20 | 19 | n/a | 0 |
| Star Tron 8 oz | 9.5 | 28 | 19 | 18 | n/a | 0 |
| Yamalube 32 oz | 9.4 | 26 | 19 | 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.
FAQ: mowing large lots
How much stabilizer does a mower tank need?
Go by the stated dose: 1 oz per 2.5 gallons of gas for either STA-BIL, and 1 oz per 5 gallons for the Pro Star.
How long does stabilized fuel stay fresh?
STA-BIL states up to 24 months. The other listings state no storage life.
Do I add stabilizer before or after fueling?
STA-BIL says to pour it into the tank before adding gasoline. The Pro Star says to add the dose, fill the tank, and run the engine for 10 minutes.
Does fuel stabilizer work in ethanol blends?
STA-BIL states it works in all gasoline including ethanol blends, and the Pro Star states it suits ethanol blends like E-10 and all other fuel types.
Does stabilizer replace draining the fuel?
STA-BIL states it eliminates the need to drain fuel prior to storage. Run the engine after dosing so the treated fuel reaches the whole system.
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