Is STA-BIL 360 worth it for a lawn mower?

Yes, if the mower sits for weeks or months between uses. It keeps the gas from going stale and protects the carburetor from ethanol corrosion, which is the usual cause of spring no-starts.

One ounce per 5 gallons of gas. The 8 oz bottle treats 40 gallons, so a 2-gallon mower can gets about 0.4 oz.

Can I use it in a car?

Yes. Add it before filling up at the pump so it mixes well. It suits cars that sit or run ethanol blends, but it is not a performance octane booster.

Does it work for winter storage?

Yes. It keeps fuel fresh for up to a year, so treat the tank and can before storage rather than in spring.

What happens if I add too much?

Nothing harmful. STA-BIL says overtreating will not damage the engine, so a rough pour is fine.

The best new price was $10.97 at The Home Depot as of November 4, 2026. Seasonal sales in fall, when people winterize equipment, are the usual time to stock up.

What do buyers say about the STA-BIL 360 Protection Ethanol Fuel Treatment?

Rated 4.8 out of 5 from 435 ratings.

Where can I buy the STA-BIL 360 Protection Ethanol Fuel Treatment?

7 stores we checked sell it, including The Home Depot, eBay, Tractor Supply Company, Walmart, Expert Power Wash.

STA-BIL 360 Protection Ethanol Fuel Treatment

4.8

Best price now

$9.98at eBayObserved at 4:06 PM

Compared across 6 stores. Prices are checked against each store and labelled with when.

Visit eBay

STA-BIL 360 Protection Ethanol Fuel Treatment

4.8

Best price now

$9.98at eBayObserved at 4:06 PM

Compared across 6 stores. Prices are checked against each store and labelled with when.

Visit eBay

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Our take on the STA-BIL 360 Protection Ethanol Fuel Treatment

STA-BIL 360 Protection is a fuel additive for ethanol-blended gasoline. It targets the problems ethanol causes: corrosion in the fuel system, gum and varnish buildup, and stale gas. One ounce treats 5 gallons, so the 8 oz bottle treats 40 gallons, and it keeps fuel fresh for up to a year. At $10.97 at The Home Depot as of November 4, 2026, it is the lowest of the 4 stores pricing it new.

Best forOwners of boats, mowers and other seasonal small enginesPeople storing gas cans or equipment for monthsDrivers of older or carbureted vehicles on E10Anyone topping up a fuel system before winter storage

Pros

Treats 40 gallons per 8 oz bottle, about 27 cents per gallon
Cleans the fuel system and fights ethanol corrosion
Keeps stored gas fresh for up to a year
Safe to overtreat, so no measuring anxiety
Widely available and cheap to run

Cons

Only a preventive additive; it will not fix a badly gummed carburetor
Needs to go in before or with fresh fuel to work best
No cetane or octane boost for performance tuning
Small bottles are easy to spill without a funnel

STA-BIL 360 Protection Ethanol Fuel Treatment prices at every store

eBayNew
In stock
$9.98Free shippingObserved at 4:06 PM
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WalmartNew
In stockSold by McAdoo MotoSports
$15.76+ $3.70 shippingObserved at 4:06 PM
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The Home DepotNew
Availability unknown
$10.97Observed at 4:07 PM
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Tractor Supply CompanyNew
Availability unknown
$8.99+ $6.99 shippingObserved at 4:06 PM
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Expert Power WashNew
Availability unknown
$10.00+ $8.95 shippingObserved at 4:06 PM
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JBTools.comNew
Out of stock
$5.56Observed at 4:06 PM
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Also available at

eBayCheck price at eBay
Outdoor Power DirectCheck price at Outdoor Power Direct

STA-BIL 360 Protection Ethanol Fuel Treatment price history

Lowest price we've seen: $5.56 on Nov 4 at JBTools.com. Tracked across 7 stores since Nov 4.

What reviewers say

Owners rate it highly, 4.8 out of 5 from 435 ratings, and most use it for seasonal equipment and stored gas. The common thread is engines starting easily after months of sitting.

Pros

Engines start after winter storage
Stored gas stays usable for months
Cheap per gallon treated
Easy to dose into a gas can

Cons

Does not rescue fuel that is already stale
Bottle design can make pouring messy

From The Home Depot

Designed to prevent corrosion caused by ethanol-blended fuels
Ideal for enhancing engine power and fuel efficiency
Designed to keep fuel fresh for long term
8 oz. treats 40 gallons of fuel

Returns: Return this item within 90 days of purchase, in store or online.

About the STA-BIL 360 Protection Ethanol Fuel Treatment

Looking to keep your fuel system functioning 100% during the season? STA-BIL 360 Protection is the ultimate ethanol treatment. STA-BIL 360 Protection, America's #1 Ethanol Treatment, is engineered to combat the negative effects of ethanol-blended fuels. This industry-leading formula prevents corrosion, cleans the fuel system, and prevents the buildup of unwanted gum and varnish; ensuring your equipment will be ready to go whenever you need it. 1oz treats 5 gallons of gas. If using with small engine equipment pour directly into your gas can that way everything you fill with that can is already treated with STA-BIL 360. If adding to a vehicle it is best practice to add STA-BIL 360 before adding fresh fuel at the pump. STA-BIL 360 is designed to be added to the fuel as soon as you get it that way you know the fuel is fresh. This formula will also keep gas fresh for up to a year. Use throughout the season to make sure your engine runs top-notch year-round! Overtreating will not harm the engine.

Questions and answers

Is STA-BIL 360 worth it for a lawn mower?: Yes, if the mower sits for weeks or months between uses. It keeps the gas from going stale and protects the carburetor from ethanol corrosion, which is the usual cause of spring no-starts.
How much do I add?: One ounce per 5 gallons of gas. The 8 oz bottle treats 40 gallons, so a 2-gallon mower can gets about 0.4 oz.
Can I use it in a car?: Yes. Add it before filling up at the pump so it mixes well. It suits cars that sit or run ethanol blends, but it is not a performance octane booster.
Does it work for winter storage?: Yes. It keeps fuel fresh for up to a year, so treat the tank and can before storage rather than in spring.
What happens if I add too much?: Nothing harmful. STA-BIL says overtreating will not damage the engine, so a rough pour is fine.
When is it cheapest?: The best new price was $10.97 at The Home Depot as of November 4, 2026. Seasonal sales in fall, when people winterize equipment, are the usual time to stock up.
Where is the STA-BIL 360 Protection Ethanol Fuel Treatment cheapest?: At eBay, for $9.98, as of our latest check.
What do buyers say about the STA-BIL 360 Protection Ethanol Fuel Treatment?: Rated 4.8 out of 5 from 435 ratings.
Where can I buy the STA-BIL 360 Protection Ethanol Fuel Treatment?: 7 stores we checked sell it, including The Home Depot, eBay, Tractor Supply Company, Walmart, Expert Power Wash.