The manufacturer states this has a shelf life of 5 years.
Northern Tool 2-Cycle/4-Cycle Fuel Treatment, 12-Oz. Bottle

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- Protects 2- and 4-cycle small engines
- Keeps fuel fresh for 12+ months
- Protects against water that ethanol attracts
- Helps ensure easy starting, even after seasonal storage
- Keeps fuel systems clean with detergens that dissolve deposits
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