Will Gasoline Deteriorate If a Car Is Not Driven for a Month?

1 Answers
DelAndrew
07/29/25 9:14pm
When a car is parked for an extended period, the gasoline in the fuel tank can expire and deteriorate. Below are the shelf lives of different types of gasoline: 1. Ethanol-blended gasoline: An increasing number of car owners are using ethanol-blended gasoline. It is important to note that ethanol-blended gasoline has a freshness period of one month. If the car is parked for more than a month, the ethanol-blended gasoline may separate into layers, affecting the normal operation of the car engine and reducing overall performance. 2. Regular gasoline: Under normal circumstances, the shelf life of regular gasoline is three months. This is because the structure of regular gasoline consists of complex organic chemical chains, and more than 99% of the carbon elements undergo chemical changes only when exposed to air. Generally, gasoline sealed in the fuel tank is less likely to deteriorate. 3. Diesel: Diesel has a shelf life of at least 12 months or even several years, but prolonged storage may lead to incomplete combustion.
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