What's the Difference Between 95 and 98 Gasoline?
2 Answers
The differences between 98-octane and 95-octane gasoline: 1. Different octane ratings: 98-octane gasoline is a mixture of 98% isooctane and 2% n-heptane, while 95-octane gasoline consists of 95% isooctane and 3% n-heptane. 2. Different anti-knock combustion capabilities: 98-octane gasoline has higher anti-knock performance and power output, whereas 95-octane gasoline has average anti-knock combustion ability. Below is relevant information about gasoline: Composition of gasoline: It appears as a transparent, flammable liquid, refined from various petroleum-derived components such as straight-run gasoline, catalytic cracking gasoline, and catalytic reforming gasoline. After refinement, it is blended with high-octane components and primarily used as fuel for spark-ignition internal combustion engines in automobiles.
Having driven for so many years, the main difference between 95 and 98 gasoline lies in the octane rating. Simply put, 98 has better anti-knock properties, making it suitable for high-performance engines or turbocharged cars. I use 95 to save money, and it works fine for daily commuting with smooth response. But when driving on mountain roads or highways, I switch to 98 for more stable acceleration—the engine doesn’t knock, and fuel consumption is about the same. For regular small-displacement family cars, 95 is practical enough—no need to waste money on 98. The car manual makes it clear; using the wrong fuel won’t help. Long-term, 98’s additives may clean the engine slightly better, but proper maintenance is enough—don’t overthink it. Safe driving is what really matters.
