Does audi a6 need premium gas?

Audi does recommend that You use premium gas in Your A6 with an octane rating of 91 or higher. Higher octane rated fuels burn more completely in Your engine and this helps improve the performance and response from the higher performance engine in Your car. There are also some gasoline options on the market that are labeled as top tier. These have detergents in them that are designed to clean up and break down sludge so that Your engine will last longer and stay cleaner inside. I recommend getting these as well since they can save You a lot of money down the road in terms of repairs and cleaning out Your engine if it does get sludge from lower cost fuels.