Audi A4L is most suitable for 95 octane (formerly 97 octane) fuel. Here are the specific details about the fuel usage for Audi A4L: Reasons for using 95 octane fuel: The Audi A4L requires the use of 95 octane or higher unleaded gasoline. Do not use gasoline with an octane rating lower than 95, as it may damage the engine and the three-way catalytic system. Simply put, the gasoline octane rating represents its anti-knock performance. Low-octane gasoline may pre-ignite under high pressure and high temperature conditions in the engine cylinder. However, this is not the optimal combustion timing. The expansion force generated by gasoline combustion will act in the opposite direction of the piston movement, causing the piston to endure significant impact and vibration. The Audi A4L can use 98 octane gasoline, which is higher than the standard requirement. Using 98 octane fuel will definitely prevent engine knocking, but it does not significantly improve the vehicle's power performance. Moreover, 98 octane gasoline is relatively expensive, and higher-octane fuel may not fully combust in the cylinder, leading to wasted fuel and carbon deposits. Therefore, from a fuel economy perspective, 95 octane gasoline is the best choice. Additionally, since the domestic fuel quality does not meet the manufacturer's EN228 standard, it is necessary to add fuel additives during each maintenance. Audi A4 using 95 octane gasoline: If 92 octane gasoline is used, the engine's power will be reduced. 95 octane gasoline consists of 95% isooctane and 3% n-heptane. High-compression engines should use high-octane gasoline. If low-octane gasoline is used in a high-compression engine, it may cause abnormal combustion, resulting in knocking, increased fuel consumption, and reduced driving performance.
