Does using 95 octane gasoline in a car designed for 92 octane have any impact?

[OSerenity]

Using 95 octane gasoline in a car designed for 92 octane has no short-term impact, but in the long run, it will reduce the service life of the car's ignition system, fuel injectors, and spark plugs, leading to an earlier need for major repairs. The appropriate gasoline grade can be determined based on the engine's compression ratio. Cars with an engine compression ratio between 8.6-9.9 should use 92 octane gasoline, those between 10.0-11.5 should use 95 octane gasoline, and if the compression ratio is even higher, 98 octane gasoline is recommended. However, with the application of some new technologies, the compression ratio alone cannot determine the gasoline grade to use. High compression ratio engines can also be tuned to use lower octane gasoline because, besides the compression ratio, other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the gasoline grade, the higher the octane number and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. Occasionally using the wrong gasoline grade only requires switching back to the correct grade after the current tank is used up. However, long-term use of the wrong gasoline grade can have the following impacts: For cars designed for lower octane gasoline, using higher octane gasoline will not cause damage, but the increase in octane number will change the fuel's ignition point, leading to delayed combustion in the engine. This means both the engine's power output and thermal efficiency will decrease, resulting in poorer performance in practice. For cars designed for higher octane gasoline, using lower octane gasoline can cause engine knocking. Because the octane number is too low, the gasoline's ignition point decreases, causing it to ignite prematurely during the compression stroke. If the gasoline ignites before the spark plug fires during the compression stroke, resistance will occur during the upward stroke. This resistance will make the engine run very unstably. If the knocking is imperceptible, it only increases noise and does not significantly damage the engine. However, if the knocking is noticeable, it indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring. Considerations when choosing gasoline: Select gasoline with appropriate volatility based on the car's operating environment temperature. Gasoline with good volatility makes cold starts easier and allows the engine to warm up smoothly. However, if the volatility is too high, it can easily cause vapor lock in the fuel lines, preventing the fuel pump from delivering gasoline properly and causing the engine to stall. Choose gasoline based on its lead content.