Can I switch from 95 to 92 gasoline after one year?

[MadelineRose]

It is not advisable to switch from 95 to 92 gasoline after one year of use. 95-octane gasoline is suitable for engines with high compression ratios. If 92-octane gasoline is used in such engines, it can lead to abnormal combustion, knocking, and even engine seizure. Additionally, carbon deposits will accumulate faster than usual, resulting in insufficient power, engine wear, or even complete failure. Gasoline is a mixture, and while the chemical compositions of both types are relatively similar, their anti-knock properties differ. 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. Here are the details: Different octane ratings: 92-octane gasoline contains 92% isooctane and 8% n-heptane. 95-octane gasoline contains 95% isooctane and 5% n-heptane. Different gasoline quality levels: The octane rating of gasoline represents its quality. Higher-octane gasoline has better anti-knock properties, allowing the engine to run more smoothly, reducing wear, and providing better protection for the engine. For vehicles designed for lower-octane gasoline, accidentally using higher-octane gasoline will not cause damage. However, the increased octane rating can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher-octane gasoline, using lower-octane gasoline can cause engine knocking. The significantly lower octane rating reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke, making the engine run very unstably. Mild knocking may only increase noise without obvious damage, but 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, simply refuel with the correct type next time to restore normal operation. Some drivers believe that using higher-octane gasoline can improve performance, but this is unnecessary if the engine's compression ratio does not meet the required standard. At best, it may result in slightly lower carbon emissions and cleaner combustion.