What are the most important features to consider when purchasing a used Audi?

As someone in the market for a pre-owned Audi, I want to make sure I am informed and make the best decision possible. What are some key factors I should keep in mind when looking at used Audis?

Inspect the car's maintenance history and service records to ensure it has been well-taken care of. Also, consider getting a pre-purchase inspection from a trusted mechanic.

It's important to research the specific model and year of the Audi you are interested in to see if there are any known issues or recalls. This can save you from potential headaches and expenses down the line.