What is the Best Octane Rating for Car Fuel?
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When refueling your car, it is best to use the gasoline octane rating recommended for your vehicle. In other words, if the vehicle recommends 92-octane gasoline, it is best to use 92-octane; if it recommends 95-octane, then 95-octane is optimal. The choice of gasoline should be based on the engine's compression ratio, and it is advisable to use the octane rating recommended by the manufacturer or a slightly higher adjacent rating. Below are some relevant details: 1. Risks of Using Excessively High Octane: Blindly using gasoline with an excessively high octane rating may lead to incomplete combustion, increased pollutant emissions, and failure to utilize its high anti-knock properties, resulting in unnecessary expenses. 2. Meaning of Gasoline Octane Rating: The octane rating indicates the fuel's resistance to knocking (anti-knock index). During combustion, gasoline first mixes with air as a vapor before entering the cylinder, where it is compressed into a smaller space for ignition. The vapor must withstand high temperature and pressure during compression to prevent pre-ignition, which is the fuel's anti-knock performance. If the octane rating is insufficient, the vapor may ignite prematurely during compression, reducing power output. Prolonged use of low-octane fuel can cause carbon buildup on the intake valves, potentially affecting the vehicle's normal operation.
