What Octane Gas Should Li Auto Use?
1 Answers
Li Auto vehicles should use 95 octane gasoline, as this fuel grade is recommended in the official vehicle owner's manual. In addition to checking the owner's manual for the appropriate gasoline grade, you can also find this information on the fuel filler cap. Typically, the fuel grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane gasoline, those between 10.0-11.5 should use 95 octane, and higher compression ratios may require 98 octane. However, with modern technologies, the compression ratio alone cannot determine the required gasoline grade, as high-compression engines can be tuned to use lower-octane fuel. Other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, higher-octane gasoline has a higher concentration of isooctane and better anti-knock properties. For example, 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane contains 95% isooctane and 5% n-heptane. Occasionally using the wrong gasoline grade in a Li Auto vehicle is not harmful as long as you switch back to the correct grade afterward. However, prolonged use of the wrong grade can have the following effects: Using a higher octane fuel in a vehicle designed for lower octane will not cause damage, but the increased octane can alter the fuel's ignition point, leading to delayed combustion. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. Using a lower octane fuel in a vehicle designed for higher octane can cause engine knocking. The significantly lower octane reduces 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 piston's upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without noticeable engine damage, but severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to severe engine damage.
