Can 92 and 95 gasoline be mixed when refueling a car?

[DiElliana]

92 gasoline and 95 gasoline cannot be mixed because their isooctane content is different. 92 gasoline is suitable for engines with low compression ratios, while 95 gasoline is suitable for engines with high compression ratios. If 92 gasoline is added to a car that should use 95 gasoline, abnormal combustion may occur, leading to knocking. Knocking not only damages the combustion chamber but also directly affects the normal operation of the engine, and in severe cases, it may cause engine damage. If 95 gasoline is added to a car that should use 92 gasoline, although it will not damage the engine, 95 gasoline is more expensive than 92 gasoline, resulting in unnecessary costs. Differences between 92, 95, and 98 gasoline: Standard gasoline is composed of isooctane and n-heptane. Isooctane has good anti-knock properties, and its octane number is defined as 100; n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, so its octane number is defined as 0. If the gasoline is labeled as 92, it means that the gasoline has the same anti-knock properties as standard gasoline containing 92% isooctane and 8% n-heptane. The same principle applies to 95 and 98 gasoline. How to handle adding the wrong gasoline: If the gasoline added is of a higher octane rating than the car requires, for example, adding 95 gasoline when 92 is specified, you can simply switch back to 92 gasoline after consuming the current fuel. If the gasoline added is of a lower octane rating than the car requires, for example, adding 92 gasoline when 95 is specified, you can add a high anti-knock fuel additive. Alternatively, you can drain the fuel and refill with 95 gasoline. To find out which gasoline your car requires, you can refer to the car's user manual or check the fuel rating marked on the fuel tank cap.