Should the 3rd Generation Haval H6 Use 92 or 95 Octane Gasoline?

[LeBrianna]

According to the official vehicle manual recommendation, the 3rd generation Haval H6 should use 92 octane gasoline. In addition to checking the appropriate gasoline grade in the vehicle manual, the 3rd generation Haval H6 owners can also find this information on the fuel tank cap, which will be clearly marked. Traditionally, the gasoline grade could also be determined by the engine's compression ratio. Vehicles with compression ratios between 8.6-9.9 typically use 92 octane gasoline, while those with ratios between 10.0-11.5 use 95 octane. However, with the application of new technologies, the compression ratio alone can no longer solely determine the appropriate gasoline grade. High compression ratio engines can now be calibrated to use lower octane gasoline due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Generally, higher octane gasoline contains higher levels of isooctane, providing better anti-knock properties. 92 octane gasoline consists of 92% isooctane and 8% n-heptane, whereas 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the 3rd generation Haval H6 occasionally uses the wrong gasoline grade, simply switching back to the correct grade after consumption is sufficient. However, prolonged use of incorrect gasoline can lead to the following issues: For vehicles designed for lower octane gasoline, using higher octane fuel won't cause damage, but the increased octane level alters the fuel's ignition point, potentially causing engine hesitation. This results in reduced engine power and thermal efficiency, manifesting as poorer performance. Using lower octane gasoline in vehicles designed for higher octane can cause engine knocking. The significantly lower octane level lowers the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance builds up during the upward stroke. This resistance leads to unstable engine operation. Mild knocking may only increase noise without significant 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 in severe cases.