Will Using 92 Octane Gasoline Affect BMW Cars?
2 Answers
Using 92 octane gasoline in BMW cars can easily damage fuel system components and cause engine mixture faults. Due to the low octane rating of 92 gasoline, the engine's high air compression ratio may lead to abnormal combustion, resulting in increased fuel consumption and engine knocking. Below are detailed explanations: Gasoline Octane Rating: The octane rating of gasoline represents its anti-knock performance and is unrelated to cleanliness or combustion speed. Gasoline engines rely on spark plugs to ignite the air-fuel mixture for combustion and power generation, making the ignition timing crucial. Too late ignition reduces torque, while too early ignition can cause knocking. If a high-compression-ratio engine uses low-octane gasoline, it may cause a sharp rise in cylinder temperature, incomplete combustion, severe engine vibration, reduced power output, component damage, increased fuel consumption, and poor driving performance. Generally, high-performance engines require higher-octane gasoline to allow advanced ignition timing and achieve optimal power output. Correct Method for Choosing Gasoline Grade: Check the label inside the fuel tank cap. The inner side of the car's fuel tank cap always has a (recommended standard) sticker, which is the most accurate and scientific standard calculated by engineers based on the engine's technical parameters.
I used to drive a BMW and tried using 92-octane fuel. Honestly, for short trips or occasional emergencies, it's not a big deal. But using it long-term can really cause problems. BMW engines have a high compression ratio, and the low octane rating of 92 can easily lead to knocking—that rattling metal sound. Last month, a friend's 730Li tried to save money by using 92-octane fuel, and within less than three weeks, the engine warning light came on. The repair shop found that the ignition timing was fluctuating wildly, and the carbon buildup on the piston tops was twice as thick as in cars using 95-octane fuel. The most painful part was spending 2,800 yuan to replace an oxygen sensor—it would have been cheaper to just use 95-octane fuel from the start.
