what is the shelf life for sta-bil after opening and does sta-bil marine have any advantage over sta-bil red? thx

I think the others are talking about the shelf life of treated fuel and not Sta-Bil itself. I've used Sta-Bil more than 15 years after first use from a container of it, and it still worked great. It has a very long shelf life after opening. The plastic container that the Sta-Bil comes in probably has a shorter life than the contents. I have never used Sta-Bil Marine, so I can't comment on it.

Can this be used in Outboard Marine engines?

The label says it can be used in all engines. I don't have an outboard engine, but I use it in cars, pickup trucks, ATV, lawn mower(walking & riding), tractor & auger.

Can this be used on old gasoline

I suggest contacting customer support at Gold Eagle for the correct answer. It's my understanding that Sta-Bil is for adding to fresh gasoline. I don't know if it's helpful to add it to old gasoline.

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⛽ Keep your engine ready to roar—stabilize, optimize, dominate!

ENGINE PERFORMANCE BOOSTER - Dissolves harmful gum and varnish deposits to maintain peak engine efficiency and power.
SUPERIOR FUEL PRESERVATION - Prevents fuel degradation and keeps your engine running smoothly during storage or downtime.
COMPACT CONVENIENT 1 GALLON SIZE - Perfect for professional use or serious DIYers who demand consistent fuel care.
MADE IN THE USA WITH TRUSTED QUALITY - Proudly manufactured by STA-BIL, a leader in fuel additives, ensuring reliability and safety.
UNIVERSAL FIT FOR ALL GASOLINE ENGINES - Compatible with cars, trucks, motorcycles, boats, generators, and lawnmowers—one stabilizer to rule them all.

STA-BIL Fuel Stabilizer (1 Gallon) is a premium fuel additive designed to prevent gasoline degradation, dissolve gum and varnish deposits, and maintain engine performance across a wide range of gasoline-powered vehicles and equipment. With a high boiling point of 180°F and universal compatibility, it ensures long-term fuel stability and engine protection, proudly made in the USA.

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Brand	Sta-Bil
Auto Part Position	Rear
Style	Modern
Vehicle Service Type	Cars, Trucks, Generators, Motorcycles, Boats, Lawnmowers
Exterior Finish	Black
OEM Part Number	22213
Automotive Fit Type	Universal Fit
UPC	073905222136
Manufacturer	STA-BIL
Model	Fuel Stabilizer, 1 Gallon
Item Weight	5 pounds
Product Dimensions	3 x 4.5 x 10.3 inches
Item model number	ST02214
Is Discontinued By Manufacturer	No
Manufacturer Part Number	Gemplers-073905222143

Fuel Stabilizer, 1 Gallon

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