What are the consequences of using 98-octane gasoline in an Audi A6?
2 Answers
There are no serious consequences. Using higher-octane fuel simply results in more complete combustion and consequently less carbon buildup. The Audi A6 requires gasoline with an octane rating of 95 or higher. 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 they are allowed to use gasoline with a higher octane rating. Gasoline comes in 92, 95, and 98 octane ratings, and different cars require different types of gasoline. The distinction in gasoline grades is due to varying proportions of certain components, which affect engine performance differently. The significance of the octane rating is: the higher the octane rating, the stronger the anti-knock properties, but it has no relation to fuel quality. The engine provides power through piston movement in the cylinders, where the spark plug initiates the piston movement, mixing and compressing gasoline and air. If the pressure is too high, knocking can occur, and the engine will not function properly. Introduction to gasoline octane ratings: 92-octane: Suitable for ordinary family cars under 100,000 yuan with no special fuel requirements. 95-octane: Compatible with most models on the market. 98-octane: Suitable for turbocharged or high-compression ratio models, as well as high-end luxury cars and high-performance sports cars.
I've been driving an Audi A6 for over three years now. Last week, I tried using 98-octane gasoline and felt the car ran smoother, with reduced engine noise, especially when accelerating to overtake. Later, I checked the owner's manual, which recommends 95-octane fuel, stating that 98-octane is a higher grade mainly beneficial for reducing engine knocking, ensuring more stable combustion, and possibly slightly extending engine life or reducing carbon deposits. However, the downside is quite noticeable—fuel costs are significantly higher. In Beijing, 98-octane is several cents more per liter than 95-octane, adding up to dozens of yuan more per tank and hundreds more per month. Overall, it's not harmful and is safe, but the cost-performance ratio is low. Unless you frequently drive long distances or pursue peak performance, regular use isn't necessary. I recommend new car owners follow the manual's recommendations—saving the extra money for maintenance or upgrading parts is more practical.
