According to the fuel type specified in the main parameters of the Buick Regal model, Buick vehicles require 95-octane gasoline. Additional information about Buick is as follows: 1. Gasoline octane rating is the ratio of the actual gasoline's anti-knock performance to that of standard gasoline: Standard gasoline is composed of isooctane and n-heptane. Isooctane has good anti-knock properties, with its octane rating set at 100; n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with its octane rating set at 0. If the gasoline is labeled as 90, it means that the gasoline has the same anti-knock performance as standard gasoline containing 90% isooctane and 10% n-heptane. Higher octane ratings are not necessarily better; the appropriate gasoline octane should be selected based on the engine's compression ratio. 2. Different engines should use different gasoline types: Generally, engines with a compression ratio between 7.5 and 8.0 should use 90-93 octane gasoline; those with a compression ratio between 8.0 and 8.5 should use 90-93 octane gasoline; those with a compression ratio between 8.5 and 9.0 should use 93-95 octane gasoline; and those with a compression ratio between 9.5 and 10.0 should use 95-97 octane gasoline. These relevant data are clearly indicated in the manual of every vehicle, so it is essential to read the manual carefully when you get a new car.
