What are the consequences of using 98 octane gasoline in an Audi A6?

[McElla]

Audi A6 can use 98 octane gasoline. The Audi A6 is designed to run on 95 octane or higher gasoline. The correct gasoline grade is indicated on the inside of the fuel filler flap. It is widely known that cars should not use gasoline with a lower octane rating than specified, but using a higher octane rating is permitted. Below is relevant information about engine oil: 1. Function of engine oil: Engine oil lubricates and reduces friction in the engine, assists in cooling, seals against leaks, prevents rust and corrosion, and cushions shocks. It is often referred to as the 'lifeblood' of a car. Choosing the right engine oil and changing it regularly can maintain the engine in good condition and extend its service life. 2. Choosing engine oil: When selecting engine oil, the most expensive option is not necessarily the best. Instead, the choice should be based on the characteristics of the car's engine and the driver's habits. Engine oil can also be categorized by season, with winter-grade oil focusing on low-temperature viscosity ratings, while summer-grade oil does not require as good low-temperature viscosity ratings due to higher temperatures.

[LeRobert]

I've been driving an Audi A6 for several years and always used 95-octane fuel, but I've tried 98-octane a few times. There were no negative effects—the engine felt smoother and quieter after starting, possibly due to better combustion, but acceleration and fuel consumption were similar to 95. The issue is that 98-octane is significantly more expensive, costing over 30 yuan more for a 60-liter tank, which adds up over a month. The Audi A6 engine has a high compression ratio designed for 95-octane, so using 98 doesn’t cause harm, but the extra cost isn’t worth it. I recommend sticking with 95—it’s economical and sensible. Don’t forget regular oil changes and maintenance; keeping the engine healthy is key, and don’t fall for the hype around premium fuel.

[McDonovan]

I drive an A6 myself and carefully calculate fuel costs. Using 98-octane gasoline? The key consequence is a shrinking wallet. Each liter of 98 is several cents more expensive than 95, adding up to dozens of yuan per tank and an extra hundred or so yuan in monthly expenses. Technically, 98 has a higher octane rating, reducing the risk of knocking, but the A6's engine is perfectly fine with 95 and doesn't need extra protection. I tried using 98—no power boost, just slightly quieter engine noise with the same fuel consumption. Overall, it's unnecessary unless you frequently drive on highways or want to try something new. Accidentally using 98 is fine; Audis are compatible with higher-grade fuel—just switch back to 95 after running out, with no impact on vehicle health. Saving money comes first; sticking with 95 is the rational choice.

[SamanthaRose]

Driving an A6 for half a year, I enjoy studying cars. What are the consequences of using 98-octane gasoline? No harm done. The engine combustion might be slightly smoother, and the power delivery a bit more stable, but the difference is negligible. The higher octane rating of 98 helps prevent knocking, but for the A6, 95-octane is sufficient for protection. The downside is the higher price per liter, which is essentially wasted money. I recommend sticking with 95-octane for daily driving—no need to waste money. Audi engines are excellently designed; they're compatible with 98-octane without any risk of damage.