Should the Audi A5 use 98 or 95 gasoline?

[McAnna]

Audi A5 can use 95 gasoline, but 98 gasoline is better. Difference in octane rating: 98 gasoline is a mixture of 98% isooctane and 2% n-heptane; 95 gasoline consists of 95% isooctane and 3% n-heptane. Difference in anti-knock combustion capability: 98 gasoline has higher anti-knock performance and power output; 95 gasoline has average anti-knock combustion capability. Gasoline appears as a transparent liquid, refined from various petroleum-derived components like straight-run gasoline, catalytic cracking gasoline, and catalytic reforming gasoline, blended with high-octane components. It is primarily used as fuel for spark-ignition internal combustion engines in automobiles.

[AriannaAnn]

I have some insights about driving an Audi A5. Should I use 98 or 95 octane? I'd directly recommend 98 octane gasoline. Most A5 models come with turbocharged engines, and 98 octane has a higher anti-knock index, preventing engine knocking while delivering more responsive throttle feedback and smoother acceleration on highways. While 95 octane works too, prolonged use may cause occasional engine vibrations and slightly higher fuel consumption. Although 98 octane is pricier, the difference per tank is just a few dozen yuan—protecting the engine matters more in the long run. After two years of driving my A5, I've noticed significantly reduced engine noise with 98 octane, and maintenance has been smoother. Don’t underestimate this choice—it’s basic respect for a performance car.

[AmeliaLee]

As a daily commuter car owner, I would choose 95-octane gasoline. The Audi A5 manual clearly states that 95-octane is compatible, while 98-octane is better but not mandatory. 95-octane is cheaper, saving a significant amount of money in the long run. For my usual city commuting, there's no noticeable difference in acceleration or power. The impact on engine lifespan is minimal as long as regular maintenance is followed. If you frequently drive long distances or seek a sportier feel, 98-octane is better, but for a modest driver like me, 95-octane is entirely sufficient. With soaring fuel prices, being economical is wise—the money saved could even cover a new tire.

[VonCalvin]

Young people drive the A5 for the thrill, and I choose 98-octane gasoline without hesitation. Tried using 95-octane on mountain roads—acceleration always felt sluggish, and the engine sounded rough. Only after switching back to 98-octane did it regain its vitality, delivering strong kickback, especially on track days—pure exhilaration. 95-octane is economical but sacrifices driving pleasure. The A5 is inherently a sports car—don’t shortchange it. The difference is less noticeable in city driving, but on the highway, the gap is immediate. The higher price is worth it—after all, chasing performance isn’t about pinching pennies. Driving it is all about that passion.

[McJulia]

From a technical perspective, the Audi A5's engine has a high compression ratio, and it is recommended to use 98-octane gasoline. The higher octane rating of 98 improves anti-knock performance, ensures more complete combustion, and optimizes power output while reducing emissions. While 95-octane is the minimum standard, occasional use may cause slight knocking, which could affect engine efficiency over time. Actual tests show that using 98-octane can reduce fuel consumption by approximately 5% and improve engine cleanliness. Always confirm the preferred fuel grade for your specific model in the owner's manual or with an Audi dealership, but for most A5 owners, 98-octane is the wise choice. Investing in higher-grade fuel helps avoid costly repairs and overhauls.