Is STA-BIL Marine 360 worth it?

If you store a boat or other gasoline engine for weeks or months, it is a cheap safeguard against stale fuel and water. For engines run regularly and refueled often, the benefit is smaller.

How much fuel does 8 oz treat?

Dosing depends on the ratio on the label, so check the bottle before mixing. An 8 oz bottle covers a modest tank; larger tanks need more than one bottle per treatment.

Does it replace octane booster?

No. STA-BIL Marine 360 does not increase octane. Use a dedicated octane booster if your engine requires higher octane.

Is it safe for catalytic converters and oxygen sensors?

Yes. STA-BIL lists it as safe for catalytic converters and oxygen sensors, and it works with both carbureted and fuel-injected engines.

When is the best time to buy it?

Boat owners stock up before winterizing season, so late summer and early fall are the busiest period. The tracked best new price is $21.59 at Amazon as of November 4, 2026.

Where is the STA-BIL Marine 360 Fuel Stabilizer cheapest?

At Amazon, for $21.59, as of our latest check.

STA-BIL Marine 360 Fuel Stabilizer

Best price now

$21.59at AmazonObserved at 4:06 PM

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Our take on the STA-BIL Marine 360 Fuel Stabilizer

STA-BIL Marine 360 is an 8 oz fuel additive for boats and other gasoline engines, formulated to stabilize fuel for up to 12 months. It removes water, prevents ethanol phase separation and protects against frozen fuel lines, and it is safe for carburetors, fuel injection, catalytic converters and oxygen sensors. It does not raise octane. The best new price is $21.59 at Amazon as of November 4, 2026, the only new listing tracked.