Should the VV7 use 92 or 95 octane gasoline?
2 Answers
The Great Wall VV7 can use 92 octane gasoline. The definition of gasoline grades and their anti-knock properties are introduced as follows: Definition of gasoline grades: 92 octane gasoline contains 92% isooctane, with the remainder being n-heptane. Similarly, 95 octane gasoline contains 95% isooctane. There is no inherent superiority between these two grades; they are simply suited for engines with different compression ratios. Anti-knock properties of gasoline grades: Isooctane is related to anti-knock properties, while n-heptane affects the combustion speed. 92 octane gasoline has relatively weaker anti-knock properties, whereas 95 octane gasoline has higher anti-knock properties and a slower combustion speed. Differences between 95 and 92 octane gasoline: The primary difference lies in the octane rating, with no other fundamental distinctions. 95 octane gasoline consists of 5% n-heptane and 95% isooctane, while 92 octane gasoline consists of 8% n-heptane and 92% isooctane. 95 octane gasoline has a higher octane rating than 92 octane gasoline, making it more stable and easier to burn, resulting in greater power output compared to 92 octane gasoline.
I've driven the VV7 for several years and always used 95-octane gasoline. This car has a turbocharged engine with high octane requirements. While 92-octane fuel is cheaper, it's more prone to causing knock, which is premature ignition in the engine. This affects performance, resulting in less smooth acceleration, and may lead to more severe carbon buildup over time. The manual clearly recommends 95-octane to protect the engine. In terms of fuel consumption, 95-octane isn't necessarily more expensive; in fact, it provides quicker response when driving. I suggest not skimping on this small expense and regularly checking spark plugs and fuel lines during maintenance to ensure the car's health. You might not notice much difference during city commutes, but on highways or uphill drives, 95-octane performs more steadily and safely. In short, stick with 95-octane to keep your VV7 in optimal condition.
