Best Fuel Stabilizer for Lawn Mowers (2026): 5 Picks for Storage
We compare five fuel stabilizer listings on treat rate, stated storage term and warranty, and rank them with the Acre Score.
On this page
Top picks at a glance
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- 1
Best OverallEthanol Shield Gallon9.7/10View on Amazon - 2
Best Multi-EngineStar Tron 32 oz9.6/10View on Amazon - 3
Best for Small StorageSTA-BIL Storage 16 oz9.5/10View on Amazon - 4
Best Split PackEthanol Shield 2-Pack9.4/10View on Amazon - 5
Best Small BottleSTA-BIL 4 oz Bottle9.3/10View on Amazon - 6
Genuine Honda Fuel Stabilizer & Corrosion InhibitorView on Amazon - 7
STA-BIL 22208 Fuel StabilizerView on Amazon - 8
CRC Marine Gasoline Fuel Stabilizer 06161View on Amazon - 9
Ski-Doo New OEM Fuel StabilizerView on Amazon
A couple of acres of lawn, a few fruit trees, and a mower that sits all winter in the shed: that is the setup where old gasoline turns into spring carburetor trouble. Choosing the best fuel stabilizer for lawn mowers is really a matter of matching the bottle to the fuel you keep: how many gallons you store, how long the machine sits, and whether the listing states 2-cycle and 4-cycle use. We compared five listings on treat rate, stated storage term and warranty, and ranked them on the Acre Score.
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Quick picks
- Best Overall Ethanol Shield Gallon: Largest stated treat rate, up to 1280 gallons, and the longest storage term, 3 years. Check price on Amazon
- Best Multi-Engine Star Tron 32 oz: Enzyme formula for mowers, cars, boats and RVs; stated 1 fl oz per 16 gallons. Check price on Amazon
- Best for Small Storage STA-BIL Storage 16 oz: 16 oz treats 40 gallons with a stated 24-month storage term. Check price on Amazon
- Best Split Pack Ethanol Shield 2-Pack: 24 oz across two bottles; the listing names 2-cycle and 4-cycle use. Check price on Amazon
- Best Small Bottle STA-BIL 4 oz Bottle: 4 oz bottle for owners who want the smallest pack of the group. Check price on Amazon
Our acreage picks
Ethanol Shield Fuel Stabilizer, 1 Gallon, Treats up to 1280 Gallons
Ethanol Shield Fuel Stabilizer in a 1-gallon bottle that treats up to 1280 gallons and stabilizes fuel up to 3 years, listed as OEM verified and used.
Read the full review
The one-gallon bottle is the bulk pick of this group. The title states it treats up to 1280 gallons and stabilizes fuel for up to 3 years, the longest stated storage term here, and the listing reports the product is verified and used by OEMs. It also states it works in all 2 and 4-cycle engines, prevents water issues, and conditions rubber and plastic.
Pros
- Treats up to 1280 gallons per bottle, the largest stated treat rate here
- Stabilizes fuel up to 3 years, the longest stated term of the five
- Listing reports it is OEM verified and used
- States use in 2-cycle and 4-cycle engines, plus rubber and plastic conditioning
Cons
- 8-pound bottle is heavy to pour into small storage cans
- No per-ounce treat ratio beyond the headline 1280-gallon figure
- No warranty term is stated
- No safety certification is stated
Star Tron Enzyme Fuel Treatment, 32 oz, Treats up to 512 Gallons
Star Tron Enzyme Fuel Treatment, a 32 fl oz concentrated formula that treats up to 512 gallons and stabilizes fuel up to 2 years, stated for all engines and fuel types.
Read the full review
Star Tron's enzyme formula is the most detailed listing of the group: 32 fl oz, a stated 512-gallon treat capacity in the title, fuel stabilization up to 2 years, and a stated ratio of 1 fl oz per 16 gallons. The bullets also state it helps with ethanol-related problems and old fuel, and name lawn mowers, cars, boats and RVs as uses.
Pros
- Stated 512-gallon treat capacity and a 2-year storage term
- Bullets state a ratio of 1 fl oz per 16 gallons
- Names lawn mowers, cars, boats and RVs as uses
- Bullets describe ethanol and water-phase claims in detail
Cons
- Title and spec table disagree on treat rate (512 gallons vs 6 gallons per fl oz)
- No warranty term is stated
- No safety certification is stated
- Performance claims in the bullets are the maker's own
STA-BIL Storage Fuel Stabilizer, 16 oz, Treats 40 Gallons
STA-BIL Storage Fuel Stabilizer in a 16 fl oz bottle that treats 40 gallons and keeps fuel fresh up to 24 months, with stated corrosion and ethanol damage protection.
Read the full review
STA-BIL Storage is the name most mower owners already know, and the listing states the two numbers that matter: 16 fl oz treats 40 gallons, and fuel stays fresh up to 24 months. It also states protection against corrosion and ethanol damage, and the maker says it eliminates the need to drain fuel before storage.
Pros
- Treats 40 gallons per 16 oz bottle, a clear stated ratio
- Stated 24-month storage term
- States corrosion and ethanol damage protection
- Maker says it eliminates the need to drain fuel before storage
Cons
- Bullets are almost empty ('Great Product')
- No warranty term is stated
- No safety certification is stated
- Smaller stated treat capacity than the bulk picks
Ethanol Shield Fuel Stabilizer, 24 oz (2 Pack)
Ethanol Shield Fuel Stabilizer as a 24 oz 2-pack with stated antioxidant, anticorrosive and phase separation claims, for 2-cycle and 4-cycle engines.
Read the full review
The 24 oz 2-pack splits the treatment across two bottles, which suits a shed and a garage can, or a mower and a blower. The listing states antioxidant and anticorrosive action, phase separation inhibition, and use in 2-cycle and 4-cycle engines.
Pros
- Two 24 oz bottles instead of one large one
- States 2-cycle and 4-cycle use
- States antioxidant, anticorrosive and phase separation claims
- Upper-cylinder lubrication and rubber protection are named
Cons
- No treat rate in gallons is stated
- No storage term is stated
- No warranty term is stated
- No safety certification is stated
Gold Eagle STA-BIL Fuel Stabilizer, 4 oz
Gold Eagle STA-BIL Fuel Stabilizer in a 4 oz bottle, part 22204-AD, the smallest pack of the five with a thin listing.
Read the full review
The 4 oz bottle is the smallest pack here, part number 22204-AD, listed by Gold Eagle. The listing states the size and little else: no treat rate, no storage term, no use claims beyond the brand name.
Pros
- Smallest bottle of the five
- Same STA-BIL brand as the larger storage bottle
- Part number 22204-AD is stated
- Package weight of 4.97 ounces is stated
Cons
- No treat rate in gallons is stated
- No storage term is stated
- No warranty term is stated
- Thinnest listing of the group
Other machines to compare
Genuine Honda Fuel Stabilizer & Corrosion InhibitorCheck price on Amazon
STA-BIL 22208 Fuel StabilizerCheck price on Amazon
CRC Marine Gasoline Fuel Stabilizer 06161Check price on Amazon
Ski-Doo New OEM Fuel StabilizerCheck price on Amazon
Side-by-side specs
| Model | Acre Score | Bottle | Treats | Storage term | Engines | Warranty |
|---|---|---|---|---|---|---|
| Ethanol Shield Gallon | 9.7/10 | 128 oz (1 gallon) | Up to 1280 gallons | Up to 3 years | 2-cycle and 4-cycle | Not stated |
| Star Tron 32 oz | 9.6/10 | 32 fl oz | Up to 512 gallons | Up to 2 years | All engines and fuels | Not stated |
| STA-BIL Storage 16 oz | 9.5/10 | 16 fl oz | 40 gallons | Up to 24 months | Engine | Not stated |
| Ethanol Shield 2-Pack | 9.4/10 | 24 oz (2 pack) | Not stated | Not stated | 2-cycle and 4-cycle | Not stated |
| STA-BIL 4 oz Bottle | 9.3/10 | 4 fl oz | Not stated | Not stated | Not stated | Not stated |
Specifications are manufacturer rated as listed, collected 21 October 2026.
Acreage and terrain fit
Ethanol Shield Gallon
Star Tron 32 oz
STA-BIL Storage 16 oz
Ethanol Shield 2-Pack
STA-BIL 4 oz Bottle
Buying guide: choosing the best fuel stabilizer for lawn mowers
Treat rates and bottle sizes
The listings state treat rates from 40 gallons (16 oz STA-BIL) to up to 512 gallons (32 oz Star Tron) to up to 1280 gallons (one-gallon Ethanol Shield). The 24 oz 2-pack and the 4 oz bottle state no treat rate, so compare those two by bottle size only: 24 oz across two bottles, or 4 oz. None of the listings states a treat ratio per ounce except Star Tron, at 1 fl oz per 16 gallons in the bullets, and its title and spec table disagree on the total, as noted in its review.
How long the listings say fuel stays fresh
Stated storage terms run from up to 24 months (STA-BIL 16 oz) to up to 2 years (Star Tron) to up to 3 years (Ethanol Shield gallon). The 2-pack and the 4 oz bottle state no term. A longer stated term matters most for a machine that sits from October to April in the shed.
2-cycle and 4-cycle engines
Both Ethanol Shield listings state 2-cycle and 4-cycle use, which covers a mower plus a string trimmer or blower running on mixed gas. Star Tron states it works in all engines and all fuel types, and names lawn mowers, cars, boats and RVs. The two STA-BIL listings name engine use but do not specify the cycle type.
Storing fuel for winter
STA-BIL Storage says its formula eliminates the need to drain fuel before storage, a maker claim worth reading on the listing itself. Whatever you buy, handle fuel away from ignition sources and refuel with the engine off and cool. Our guide on whether to leave gas in a mower over winter walks through the choice: Should You Leave Gas in a Mower Over Winter?
What none of the listings state
No warranty term is stated on any of the five listings, so no listing earns warranty points and the ranking comes down to treat rate, storage term and listing completeness. No safety certification is stated either, so safety scores sit at zero across the board. A thin listing is not a bad product; it is just a harder one to compare.
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
- If you winterize several gas machines, the 128 oz Ethanol Shield gallon treats up to 1280 gallons and lists a 3-year storage term.
- If you keep both a mower and a string trimmer or blower, the Ethanol Shield 2-pack names 2-cycle and 4-cycle use and splits into two bottles.
- For a single mower and one storage can, the 16 oz STA-BIL treats 40 gallons with a stated 24-month term.
- No warranty term is stated on any of the five listings, so buy by treat rate and bottle size rather than by coverage.
The Acre Score explained
The Acre Score weighs five factors: performance (treat rate and storage term), build quality (stated formulation and packaging), value (bottle size against the stated specs), safety (stated safety features), and warranty (stated term and coverage). Each pick’s score shows in the compare table and its product card.
| Product | Acre Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Ethanol Shield Gallon | 9.7 | 30 | 21 | 22 | n/a | 0 |
| Star Tron 32 oz | 9.6 | 28 | 20 | 20 | n/a | 0 |
| STA-BIL Storage 16 oz | 9.5 | 27 | 20 | 20 | n/a | 0 |
| Ethanol Shield 2-Pack | 9.4 | 23 | 19 | 18 | n/a | 0 |
| STA-BIL 4 oz Bottle | 9.3 | 21 | 16 | 18 | 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 long can fuel sit in a mower with stabilizer added?
The listings state up to 24 months (STA-BIL 16 oz), up to 2 years (Star Tron), and up to 3 years (Ethanol Shield gallon). The 2-pack and the 4 oz bottle state no term, so there is nothing to check against.
Does stabilizer work in a 2-cycle mower or trimmer engine?
Both Ethanol Shield listings state 2-cycle and 4-cycle use, and Star Tron states it works in all engines and all fuel types. The two STA-BIL listings name engine use but do not specify the cycle type.
Should I drain the tank or add stabilizer for winter storage?
STA-BIL Storage says its formula eliminates the need to drain fuel before storage, so on that listing the answer is to treat and leave it. See our full walk-through in Should You Leave Gas in a Mower Over Winter?
How much stabilizer goes into a gallon of gas?
Star Tron is the only listing that states a ratio: 1 fl oz per 16 gallons in the bullets. The other four listings state no per-gallon ratio, so follow what the bottle you buy says.
Can I use the same bottle in my mower, truck and boat?
Star Tron’s listing names lawn mowers, cars, boats and RVs as uses, so it is the multi-engine pick here. The other listings speak about engines and fuel systems in general, without naming other machines.
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