Can Different Octane Gasolines Be Mixed?
1 Answers
92-octane gasoline and 95-octane gasoline cannot be mixed because they have different isooctane contents. 92-octane gasoline is suitable for engines with low compression ratios, while 95-octane gasoline is suitable for engines with high compression ratios. If 92-octane gasoline is added to a car that requires 95-octane gasoline, abnormal combustion may occur, leading to engine knocking. Knocking not only damages the combustion chamber but also directly affects the normal operation of the engine, and in severe cases, may cause engine damage. If 95-octane gasoline is added to a car that requires 92-octane gasoline, although it will not damage the engine, 95-octane gasoline is more expensive than 92-octane, resulting in unnecessary costs. Differences between 92, 95, and 98-octane gasoline: Standard gasoline is composed of isooctane and n-heptane. Isooctane has good anti-knock properties, and its octane rating is set at 100. N-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, so its octane rating is set at 0. If the gasoline is labeled as 92-octane, it means 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-octane gasoline. How to handle adding the wrong gasoline: If the gasoline added has a higher octane rating than required by the car (e.g., 95-octane instead of 92-octane), simply use up the gasoline and then refill with 92-octane. If the gasoline added has a lower octane rating than required (e.g., 92-octane instead of 95-octane), you can add a high anti-knock fuel additive. Alternatively, you can drain the fuel tank and refill with 95-octane gasoline. To determine the correct gasoline for your car, refer to the owner's manual or check the fuel grade marked on the fuel tank cap.
