Will using 92 octane gasoline in a car designed for 95 octane have any impact on the vehicle?

[VonEmmanuel]

Using 92 octane gasoline in a car designed for 95 octane will have an impact, as the engine compression ratios for these two fuels are different. 95 octane gasoline is suitable for vehicles with higher engine compression ratios. If such a vehicle uses 92 octane gasoline, it may cause engine knocking. It is best to use the gasoline that matches your car's requirements. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 65% isooctane and 5% n-heptane. From a chemical composition perspective, a higher isooctane content indicates better anti-knock performance. Therefore, the main difference between 92 octane and 95 octane gasoline lies in their anti-knock properties. Note that if a car that normally uses 95 octane gasoline occasionally uses 92 octane, it may be acceptable once or twice. However, prolonged mixed usage can lead to engine knocking, resulting in weak engine power output and loud, metallic knocking sounds during driving. In such cases, the engine condition should be checked immediately. Additionally, using 92 octane gasoline in a car designed for 95 octane can increase carbon deposits in the engine. Under the same conditions, 92 octane gasoline produces 0.0154g of carbon deposits, while 95 octane gasoline produces 0.0117g. Although the difference is only 0.0037g, prolonged use can lead to increased carbon deposits. Moreover, the engine is not optimized for different octane ratings, and severe cases may even clog the fuel system.