Why does Volkswagen use 95-octane gasoline?
2 Answers
Volkswagen vehicles use 95-octane gasoline because most of its models are equipped with turbocharged engines. During high-speed driving, the turbocharger operates more powerfully, which imposes strict requirements on gasoline. 95-octane gasoline has better anti-knock properties compared to 92-octane gasoline. If German cars use 92-octane gasoline for an extended period, it can lead to engine knocking, which is very dangerous. Below is some relevant information about gasoline: 1. The difference in gasoline grades lies in the octane value of the additives (which affects anti-knock performance). The higher the gasoline grade, the higher the octane value, and the better the anti-knock performance, making it more suitable for high-compression ratio engines. However, this is not absolute, as it also depends on the manufacturer's technology, tuning, and the engine's inherent properties. 2. Lower-grade gasoline has higher lead and gum content. If a vehicle that requires 95-octane gasoline uses 92-octane or lower, it can cause engine knocking, damaging the engine, oxygen sensors, and other components.
As someone particularly interested in automotive technology, I've found that Volkswagen recommends using 95-octane fuel primarily because their engines are designed with higher compression ratios. This is similar to how high-performance engines require more refined fuel to match. Many Volkswagen models, such as the Tiguan or Jetta, utilize turbocharging technology, achieving compression ratios of 10:1 or higher. This design enhances combustion efficiency and delivers more power, but the downside is an increased risk of knocking—where fuel ignites prematurely, causing abnormal noises and vibrations, and potentially damaging the cylinder block and pistons. 95-octane gasoline has a higher octane rating, which better resists knocking and ensures smooth engine operation. In contrast, ordinary family cars like the Honda Fit might suffice with 92-octane fuel, but Volkswagen insists on 95-octane to protect component longevity and avoid increased maintenance costs. Using lower-octane fuel might not show immediate effects, but over time, it accelerates wear, leading to higher fuel consumption and increased emissions.
