Gasoline-powered marine fuel care
1 US fl oz per 10 US gallons
Use the exact Marine formula directions
Choose the 32 oz marine treatment when a quart-size purchase fits your refueling plans. At the documented rate it provides up to 320 US gallons of total treatment capacity. Marine gasoline fuel treatment is intended for the fuel-care needs of gasoline-powered boats and other suitable watersport equipment. The manufacturer positions this formula for use at every fill-up, supporting fuel-system cleaning and corrosion protection when used as directed. It is a different product from diesel stabilizer, fogging oil and a carburetor-cleaning aerosol.
Choose the container quantity by how much fuel you plan to treat across your refueling schedule. The measured rate remains the same across the listed sizes. Calculate the dose for the fuel being added or treated rather than using package size as a single-tank instruction.
Before selecting a marine ethanol fuel treatment, check the gasoline and ethanol limits approved by the engine manufacturer. The additive’s compatibility statement does not authorize a fuel blend that your boat or engine does not permit. Review the product label and refueling procedure before application.
If the boat will be laid up, compare the storage instructions for this formula with the requirements of the engine and fuel system. Fuel treatment is one part of maintenance and does not replace inspection, water-separator servicing or other tasks required by the equipment manual. Keep the remaining additive closed and stored as its label directs.
Clear Product Details
Review the 16 oz gel format, specifications and application directions.
Surface Guidance
Check fiberglass, gelcoat and finish suitability before use.
Product Support
Ask about your surface and stain type before ordering.
Shipping & Returns
Review shipping information and return conditions before purchase.
FUEL & ENGINE CARE GUIDE
Plan the Correct Marine Gasoline Fuel Treatment Task
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Plan the Fuel Quantity
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Measure the Marine Dose
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Add Before Refueling
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Maintain the Fuel System
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Review Storage Plans
Compare the Formula, Package and Maintenance Task
Fuel Treatment & Engine Care Selection Guides
What Customers Say
Ultimate vapor corrosion defense for seasonal boat storage
The 32oz STA-BIL 360 Marine bottle (MPN 22240) is essential for my 75-gallon boat tank. Its vapor technology coats internal fuel components above and below the fuel line, preventing rust and ethanol damage during off-season layup.
Convenient 32oz size with built-in measuring dispenser
The squeeze-and-pour measuring top on this 32oz bottle makes treating precise fuel gallons quick and mess-free. Keeps ethanol-blended gas stable and prevents phase separation effectively.
Fast delivery from Mariner's Warehouse
Ordered directly from Mariner's Warehouse and it arrived securely packaged within a few days. Keeps my outboard running smoothly without clogged fuel injectors or gummed-up lines.
Smooth idling and restored throttle response
Noticed a clear improvement in engine performance after treating my marine fuel. Strips out trapped moisture and prevents carbon buildup across all internal engine components.
A must-have for humid marine environments
Humidity around coastal waters usually degrades ethanol gas quickly. STA-BIL 360 Marine prevents phase separation and corrosion, ensuring trouble-free startups every time.
Fired up on the first crank after winterization
Added this 32oz fuel treatment before winterizing my boat engine. Came back four months later and it started right up without stalling or hesitation.
Best value fuel additive for medium and large boats
Treats up to 160 gallons of fuel per bottle. Great value, excellent protection against rust, and cleans the fuel system while you run your engine.
Frequently Asked Questions
Is this marine product for gasoline or diesel?
This Marine formula is for suitable gasoline applications. Choose a diesel-specific additive for diesel fuel.
What is the Marine treatment rate?
The manufacturer specifies 1 US fl oz per 10 US gallons of fuel. Follow the supplied label.
When should it be added?
The manufacturer directs adding it before refueling and recommends every-fill-up use.
Does a larger package change the dose?
No. Package volume changes total capacity, not the rate per gallon.
What is the stated stabilization period?
The manufacturer states up to 12 months when the product is used as directed with fresh fuel.
Does it permit an otherwise prohibited ethanol blend?
No. Follow the engine manufacturer’s fuel and ethanol limits regardless of additive compatibility.
Is it the same as fogging oil?
No. Fogging oil protects internal engine surfaces through the approved preservation method; this is a fuel-tank additive.
How much can this package treat?
Choose the 32 oz marine treatment when a quart-size purchase fits your refueling plans. At the documented rate it provides up to 320 US gallons of total treatment capacity. This is calculated total capacity across treatment events, not a single-tank dose.
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