Does gasoline go bad? | Live Science
Crude oil lasts hundreds of millions of years underground, but is gasoline at risk of spoiling?
www.livescience.comGasoline does not have a fixed expiration date, but its usable life depends on storage conditions and fuel quality. In general, unopened pump gasoline kept in a stable, cool environment stays usable longer than gasoline in a container exposed to heat, moisture, or air, and with ethanol blends degrading faster than pure gasoline. Practically, expect:
- Unstabilized gasoline: roughly 3 to 6 months in a sealed container; shorter if exposed to heat or air.
- With fuel stabilizers: shelf life can extend to about 1 year or slightly more under ideal conditions.
- In vehicles or portable storage that’s not perfectly sealed, usable life may be shorter and engine performance can decline even before complete failure.
If you’re storing gasoline for emergencies or long periods:
- Use a certified fuel stabilizer designed for gasoline.
- Store in a tightly sealed, vented container away from heat and direct sunlight.
- Keep containers upright and away from living spaces, and rotate stock annually if possible.
- For fuels with ethanol (E10, E15, etc.), be aware ethanol absorbs moisture and can separate and degrade faster than pure gasoline.
Signs gasoline has degraded: dark discoloration, varnish or gum residues, varnished smell, engine starts hard, runs rough or stalls, or reduced fuel economy. If you suspect bad fuel, drain and dispose of it properly and refill with fresh gasoline.
If you want, I can tailor storage recommendations for your setup in Buffalo, NY (temperature patterns, seasonal humidity), and suggest a simple rotation schedule.