Should the Buick GL8es use 92 or 95 octane gasoline?

[KevinAnn]

The Buick GL8es should use 95 octane gasoline. Correct method for selecting gasoline octane rating: Check the label inside the fuel filler cap. The inside of the car's fuel filler cap will have a sticker with the recommended standard, which is the most accurate and scientific standard calculated by engineers based on the engine's technical parameters. Hazards of using the wrong gasoline: If a high-compression engine uses low-octane gasoline, it will cause incomplete combustion, severe engine vibration, reduced power output, damage to components, increased fuel consumption, and poor driving performance. However, if a low-compression engine uses high-octane gasoline, it will result in delayed combustion, meaning the auto-ignition point is not reached at maximum compression, leading to incomplete combustion. This requires additional fuel injection to ensure power output, which not only offers no benefit to the engine but also increases fuel consumption.