What does 95-octane gasoline mean?

[LaMadeline]

95-octane gasoline refers to standard gasoline with an anti-knock performance equivalent to a mixture of 95% isooctane and 5% n-heptane. The higher the gasoline octane number, the stronger its anti-knock performance. Standard gasoline is composed of isooctane and n-heptane. The implementation of this standard will help improve the overall quality of automotive gasoline in China, reduce vehicle emissions, and decrease nitrogen oxide and particulate emissions from new vehicles by 25% and 80%, respectively. For in-use vehicles, emissions can be reduced by 10% to 15% overall. This standard is significant for environmental protection and improving air quality. Relevant information about gasoline is as follows: Introduction: Gasoline is a volatile, flammable hydrocarbon mixture liquid distilled and cracked from petroleum, used as fuel. It appears as a transparent liquid, is flammable, and has a distillation range of 30°C to 220°C. Key characteristics: The important properties of gasoline include volatility, stability, anti-knock performance, corrosiveness, and cleanliness. Standard: On December 18, 2013, the mandatory national standard for Phase V automotive gasoline was released. 95-octane gasoline complies with this standard. The standard took effect upon release, and Phase V automotive gasoline was supplied nationwide starting January 1, 2018. High-compression engines should use high-octane gasoline. Using low-octane gasoline in high-compression engines can cause abnormal combustion, leading to knocking, increased fuel consumption, and reduced power. However, high-compression engines can also use low-octane gasoline. The choice of gasoline octane should not be blindly based on compression ratio but should follow the manufacturer's recommendations. In addition to checking the appropriate gasoline octane in the vehicle manual, you can also find it on the fuel tank cap. Typically, the gasoline octane can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6 and 9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0 and 11.5 should use 95-octane gasoline. If the compression ratio is higher, 98-octane gasoline is recommended. However, with the use of new technologies, the choice of gasoline octane cannot be solely based on compression ratio. High-compression engines can be tuned to use low-octane gasoline because factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Occasionally using the wrong gasoline octane is not a problem as long as you switch back to the correct octane afterward. However, long-term use of the wrong gasoline octane can have the following effects: Using high-octane gasoline in a vehicle designed for low-octane gasoline will not cause damage, but the increased octane number may alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. Using low-octane gasoline in a vehicle designed for high-octane gasoline can cause engine knocking. Because the octane number is too low, the gasoline's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unstable. If the knocking is mild, it may only increase noise without significant engine damage. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring.