Can I switch back to 92 after using 95?

[VanMalachi]

92 and 95 gasoline cannot be mixed. If you accidentally use the wrong gasoline grade occasionally, simply switch back to the correct grade after using it up. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended for low-grade gasoline, using high-grade gasoline will not cause damage, but the increase in octane value will alter the fuel's ignition point, leading to delayed ignition in the engine. This means both the engine's power output and thermal efficiency will decrease, resulting in poorer performance in practice. For vehicles recommended for high-grade gasoline, using low-grade gasoline can cause engine knocking. Because the octane value is much lower, the gasoline's ignition point decreases, causing it to ignite prematurely during the compression stroke. If the fuel ignites before the spark plug fires during the compression stroke, resistance will occur during the upward stroke. This resistance makes the engine run very unstable. If the knocking is imperceptible, it only increases noise without significant damage to the engine. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring. Besides checking the appropriate gasoline grade in the car's manual, you can also find it on the fuel tank cap, which usually indicates the recommended grade. Typically, the gasoline grade can also be determined based on the engine's compression ratio. Cars with a compression ratio between 8.6-9.9 should use 92 gasoline, while those with a compression ratio between 10.0-11.5 should use 95 gasoline. However, with the use of new technologies, the compression ratio alone cannot determine the gasoline grade. High compression ratio engines can still be tuned to use low-grade 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 value, and the better the anti-knock performance. 92 gasoline contains 92% isooctane and 8% n-heptane, while 95 gasoline contains 95% isooctane and 5% n-heptane.