Can Temporary License Plates Be Issued on Saturdays and Sundays?

[StBriella]

For the Geely Xingyue models equipped with the JLH-4G20TDB turbocharged engine, it is recommended to use 95-octane gasoline; for models with the JLH-3G15TD engine, 92-octane gasoline is recommended, as specified in the vehicle's official user manual. In addition to checking the suitable gasoline grade in the user manual, Geely Xingyue owners can also find this information on the fuel tank cap, where the recommended gasoline grade is usually indicated. Generally, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with an engine compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95-octane gasoline. If the compression ratio is even higher, 98-octane gasoline is recommended. However, with the application of new technologies, the compression ratio alone cannot determine the appropriate gasoline grade, as high-compression engines can sometimes be tuned to use lower-octane gasoline. This is because 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. If a Geely Xingyue owner occasionally uses the wrong gasoline grade, simply switching back to the correct grade after the tank is empty is sufficient. However, prolonged use of the wrong gasoline grade can have the following effects: For vehicles designed for lower-octane gasoline, using a higher-octane grade will not cause damage, but the increased octane number 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 a lower-octane grade can cause engine knocking. The significantly lower octane number lowers the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, it creates resistance during the upward stroke. This resistance makes the engine run very unevenly. If the knocking is mild, it may only increase noise without noticeable engine damage. However, severe knocking indicates serious engine issues, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.