Should the Changan CS75 Plus use 92 or 95 octane gasoline?
2 Answers
The Changan CS75 Plus can use 92 octane gasoline. The function of the fuel system is to supply the engine with a certain amount of clean, well-atomized gasoline according to the operating conditions of the engine, so that it can mix with a certain amount of air to form a combustible mixture. The fuel system needs to store a considerable amount of gasoline to ensure that the car has a sufficiently long driving range. The differences between 92 and 95 octane gasoline are as follows: Different anti-knock properties: The gasoline grade represents the anti-knock property, and the higher the grade, the better the anti-knock ability. Different isooctane content: 92 octane gasoline consists of 92% isooctane and 8% n-heptane, while 95 octane gasoline consists of 95% isooctane and 5% n-heptane. The reason why 95 octane gasoline is slightly more expensive is due to the higher proportion of isooctane. Different prices: A tank of 95 octane gasoline is slightly more expensive than a tank of 92 octane gasoline. Relevant information about gasoline: Definition of gasoline: Gasoline is a volatile, flammable hydrocarbon mixture liquid distilled and cracked from petroleum, which can be used as fuel. Important characteristics of gasoline: The important characteristics of gasoline are volatility, stability, anti-knock properties, corrosiveness, and cleanliness.
I've been driving the Changan CS75 Plus for over three years, and the vehicle manual clearly states that it's recommended to use 95-octane gasoline. Why is that? Because this car's engine has a relatively high compression ratio, using 92-octane fuel may cause knocking, which is abnormal combustion during ignition, leading to loud noises and potential damage to engine components. At first, I tried saving money by using 92-octane, but I noticed slower acceleration and more noise. After switching to 95-octane, the power response improved significantly, and fuel consumption stabilized. In the long run, although 95-octane fuel costs a few cents more per liter, the maintenance costs are lower, saving me from repair hassles. I recommend following the manual's suggestion and using 95-octane fuel for better reliability—don't lose big for small gains. By the way, regularly checking the fuel tank cap's seal can also prevent evaporation losses.
