Does petrol expire

Answer 1

Over a short time period (weeks), gasoline does not change much. But it is a mixture of several different hydrocarbons, and over a period of months, it will slowly lose dissolved gases, such as oxygen or nitrogen, and the most volatile petroleum fractions. If it is not in a perfectly sealed container, it may thicken, and in gas tanks and engines it may accumulate particulates, corrosion, and water.

These changes mean that it may not provide the proper qualities for fuel-injected engines, or may clog fuel filters. It is always best to use the freshest gasoline available. In small engines such as lawn mowers, mixing new gas with old may allow it to be used without damaging the engine. Ideally, however, excess gas should be drained from tanks and fuel lines before long-term storage.

* ALSO -- see the more comprehensive answer at the related question.

Answer 2

Yes, petrol can degrade over time due to evaporation and oxidation processes. The shelf life of petrol is typically around 3-6 months when stored in a sealed container, but this can vary depending on factors such as temperature and exposure to air. It's recommended to use petrol within a few months to ensure optimal performance in your vehicle.