Is it mandatory to use 95-octane gasoline for the Jetta VS5?

[HopeMarie]

The manufacturer of the Jetta VS5 specifies the use of 95-octane gasoline. Using 95-octane gasoline provides better protection for the Jetta VS5's engine. The type of gasoline to use should follow the manufacturer's requirements, and one should not blindly choose the gasoline grade based on the compression ratio alone. Relevant information about 95-octane gasoline is as follows: 1. 95-octane gasoline consists of 95% isooctane and 3% n-heptane. High-octane gasoline should be used when the engine has a high compression ratio. Using low-octane gasoline in a high-compression engine can lead to abnormal combustion, causing knocking, increased fuel consumption, and reduced driving power. 2. There is no fundamental difference in quality between 92-octane and 95-octane gasoline; neither has issues with fuel impurities. 92-octane gasoline contains 92% isooctane + 8% n-heptane, while 95-octane gasoline contains 95% isooctane + 5% n-heptane.