Can I switch back to 92 after adding 95?

[KeiraMarie]

You can switch back to 92 after adding 95. Occasionally using the wrong gasoline grade only requires switching back to the correct grade after consumption. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles designed for lower grades, accidentally using higher-grade gasoline will not cause damage, but the increase in octane rating will alter 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. For vehicles designed for higher grades, using lower-grade gasoline can cause engine knocking. Because the octane rating is significantly lower, the reduced ignition point may cause premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance will arise during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without obvious engine damage, but noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring. Besides checking the recommended gasoline grade in the vehicle's manual, you can also find it on the fuel cap. Generally, the gasoline grade can be determined by the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92-grade gasoline, those between 10.0-11.5 should use 95-grade gasoline, and higher compression ratios may require 98-grade gasoline. However, with modern technologies, the compression ratio alone cannot determine the required gasoline grade. High compression ratio engines can also be tuned to use lower-grade gasoline due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Generally, higher gasoline grades have higher octane ratings and better anti-knock performance. 92-grade gasoline contains 92% isooctane and 8% n-heptane, while 95-grade gasoline contains 95% isooctane and 5% n-heptane.