Should Nissan Teana Use 92 or 95 Octane Gasoline?

[SkylarRose]

According to the official vehicle manual recommendation, the Nissan Teana with a 2.0L naturally aspirated engine should use 92 octane gasoline, while the 2.0L turbocharged engine should use 95 octane gasoline. In addition to checking the appropriate gasoline grade in the vehicle manual, Nissan Teana owners can also find this information on the fuel tank cap, which is usually labeled. 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, those between 10.0-11.5 should use 95 octane gasoline, and higher compression ratios may require 98 octane gasoline. However, with the application of new technologies, the compression ratio alone cannot solely determine the gasoline grade, as high compression ratio engines can also be tuned to use lower octane gasoline. Other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the gasoline octane number, the higher the octane value 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 you occasionally use the wrong gasoline grade in your Nissan Teana, simply switch back to the correct grade after the tank is empty. However, prolonged use of the wrong gasoline grade can have the following effects: For vehicles designed for lower octane gasoline, using higher octane gasoline will not cause damage, but the increased octane value may alter the fuel's ignition point, leading to delayed combustion in the engine. This can reduce the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher octane gasoline, using lower octane gasoline can cause engine knocking. The significantly lower octane value reduces the fuel's ignition point, causing premature ignition during the compression stroke. If the fuel ignites before the spark plug fires, resistance will occur during the upward stroke. This resistance makes the engine run very unstably. If the knocking is mild, it may only increase noise without obvious engine damage. However, severe knocking indicates serious engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in extreme cases, cylinder scoring.