STA-BIL® Fuel Stabilizer will keep fuel fresh for up to 24 months, guaranteed. Depending on the quality, type and source of the gasoline, as well as storage conditions, doubling the dosage rate of STA-BIL® brand could prolong this storage time to up to 2 years. However, any gasoline stored for more than 12 months will tend to lose volatility (ignitability), which could lead to hard starting or no start conditions after this long storage period. NO additive, STA-BIL® brand included, will prevent volatility loss in fuel.
To reduce fuel volatility loss during storage, we recommend filling your tank at least 95% full with fresh fuel and STA-BIL® brand, and store in cool conditions away from direct sunlight if possible. If you forget to stabilize your fuel prior to storage and do experience problems starting your equipment after storage, we recommend trying our StartYourEngines!® Fuel System Revitalizer product.