Gasoline-powered marine fuel care
1 US fl oz per 10 US gallons
Use the exact Marine formula directions
The 8 oz marine-treatment package is the smallest listed Marine size in this batch. At the documented rate it provides up to 80 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
Unbeatable vapor corrosion protection for marine engines
The STA-BIL 360 Marine formula works wonders above and below the fuel line. It releases a protective vapor inside the tank that prevents rust and corrosion. Essential treatment for keeping my outboard engine running clean.
Perfect 8oz size for routine boat fill-ups
This 8oz bottle (MPN 22239) is very easy to store on board. It treats ethanol-blended fuel effectively and strips out moisture before it causes phase separation. Highly recommend for any boat owner.
Fast shipping from Mariner's Warehouse
Arrived promptly and well-packaged. STA-BIL 360 Marine cleans up fuel injectors, removes carbon deposits, and keeps fuel fresh throughout the boating season.
Prevents ethanol damage in damp marine environments
Ethanol gas attracts water fast on the lake. Adding this 360 Marine additive with every fill-up gives peace of mind knowing the whole fuel system is protected against corrosion.
Keeps engine idling smooth and responsive
Noticed an immediate improvement in throttle response and smoother idling after adding this to my 4-stroke marine engine. Fights off bad gas and gumming up effortlessly.
Top-grade fuel additive for all seasons
Great product from STA-BIL. The 8oz squeeze chamber makes measuring out exact dosages super clean and accurate without spilling a drop on deck.
Hassle-free protection against phase separation
Been using STA-BIL 360 Marine for over a year now. Never had a clogged fuel filter or hard start since I started treating my gas tanks with it.
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?
The 8 oz marine-treatment package is the smallest listed Marine size in this batch. At the documented rate it provides up to 80 US gallons of total treatment capacity. This is calculated total capacity across treatment events, not a single-tank dose.
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