What is the Difference Between 98 and 95 Octane Gasoline?
3 Answers
98 octane gasoline and 95 octane gasoline differ in the following aspects: 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 offers higher anti-knock performance and power, whereas 95 octane gasoline has average anti-knock combustion capability. Below is some relevant information about gasoline: Gasoline appears as a transparent liquid and is produced by refining various gasoline components obtained from petroleum refining, such as straight-run gasoline components, catalytic cracking gasoline components, and catalytic reforming gasoline components. After refining, it is blended with high-octane components and primarily used as fuel for spark-ignition internal combustion engines in automobiles.
I've been driving for over 20 years and feel the biggest difference between 98 and 95 octane gasoline is the stronger anti-knock capability. 98 octane has a higher octane rating, meaning it's less prone to pre-ignition or knocking under high temperature and pressure, especially during high-speed driving in summer when the engine runs more smoothly with smoother power output. But the trade-off is a slightly higher price, costing a few cents more per liter. For my old high-compression ratio engine car, using 98 octane does reduce vibration and noise, slightly lowers fuel consumption, and might save money in the long run. Most regular family cars can use 95 octane just fine - it's economical and practical unless the manual recommends premium fuel. I suggest testing the engine's response and not switching fuels randomly to save money, safety first.
As an automotive enthusiast, I've researched gasoline octane ratings. The core difference between 95 and 98 octane is that 98 has a higher octane number, which means better anti-knock properties, reducing engine knocking and pre-ignition for more complete combustion. This is particularly noticeable in high-performance or turbocharged engines, where it can slightly boost power and fuel efficiency, and even reduce emissions. However, 98 octane is more expensive, costing dozens more per tank, offering little benefit for daily commuting with small-displacement cars. From my experience, unless your vehicle's manual specifically requires it, 95 octane offers better value for money and avoids unnecessary expenses. Remember, different brands' additives also play a role, so choose what suits your engine best.
