Should the older GL8 use 92 or 95 octane gasoline?

[SanIsaac]

The older Buick GL8 2.5L model, as per the manufacturer's guidance, should use 92 octane or higher quality unleaded gasoline. The Buick GL8 2.0L model, according to the manufacturer's guidance, should use 95 octane or higher quality unleaded gasoline. The gasoline must comply with the standards of GB18352.5-2013 and GB17930-2013. Below is an introduction to 92 and 95 octane gasoline: 92 octane gasoline: 92 octane gasoline contains 92% isooctane and 8% n-heptane. 95 octane gasoline: 95 octane gasoline contains 95% isooctane and 5% n-heptane. When the pistons move inside the engine cylinders, gasoline and air mix and compress within the cylinders. If the pressure is too high, knocking can occur.