Can 95 gasoline be replaced with 92 gasoline?

[DiIan]

95-octane gasoline can occasionally be mixed with 92-octane gasoline, but long-term mixing is not recommended as it may cause engine knocking. 95-octane gasoline is suitable for engines with high compression ratios. If 92-octane gasoline is used in a high-compression engine, abnormal combustion may occur, leading to knocking and potential engine damage. Additionally, carbon deposits in the engine may accumulate faster than usual, resulting in insufficient power, engine wear, or even engine failure. Gasoline is a mixture, and the chemical compositions of the two types are relatively similar, with strong anti-knock properties. However, to ensure vehicle safety, it is recommended to use them separately. The difference between 92 and 95 gasoline lies in their octane ratings and quality levels, as detailed below: Different octane ratings: 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. Different gasoline quality levels: The octane rating of gasoline represents its anti-knock performance. Higher octane ratings indicate better anti-knock properties, which allow the engine to run more smoothly, reduce wear, and provide better protection for the engine. It is suggested that using higher-octane gasoline in a vehicle designed for lower-octane fuel will not cause damage, but the increase in octane may alter the fuel's ignition point, leading to delayed combustion in the engine. This can reduce the engine's power output and thermal efficiency, resulting in poorer performance. Using lower-octane gasoline in a vehicle designed for higher-octane fuel may cause engine knocking. The significantly lower octane rating lowers the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance will be generated during the upward stroke, making the engine run very unstably. Mild knocking may only increase noise without obvious engine damage, while severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring. If you accidentally mix or use the wrong octane gasoline, refueling with the correct octane gasoline next time should restore normal operation. Some drivers believe that using higher-octane gasoline can improve performance, but this is unnecessary because the engine's compression ratio may not meet the required standards, rendering the higher-quality fuel ineffective. At best, it may result in slightly cleaner combustion and reduced carbon deposits.