Is it okay to use higher-grade gasoline in a low-end car?

[AnastasiaRose]

It is not recommended to use higher-grade gasoline; just follow the manufacturer's recommendation. The reasons are as follows: 1. Explanation of gasoline grades: The octane number of gasoline represents its anti-knock performance, but higher is not necessarily better. Car owners should choose gasoline with the appropriate octane number based on the engine compression ratio specified in the vehicle's manual. Using gasoline with a lower octane number than recommended can lead to increased cylinder temperature, incomplete combustion, reduced power output, engine knocking, and even damage to the vehicle's ignition system. Conversely, blindly choosing gasoline with an excessively high octane number can alter the ignition timing, cause carbon buildup in the cylinders, and, over time, affect the engine's lifespan. 2. Gasoline grade and compression ratio: The commonly referred-to 90, 93, and 97 octane numbers represent the ratio of the actual gasoline's anti-knock performance to that of standard gasoline. If a high-compression-ratio engine uses low-octane gasoline, it can cause knocking, accelerate component aging, and lead to frequent malfunctions.