What are the most common causes of Audi engine failure?

I have noticed that my Audi engine is not running as smoothly as it used to. It's making strange noises and the performance seems to have decreased. What could be causing this and how can I prevent it?

The most common cause of Audi engine failure is lack of proper maintenance. Make sure to always follow the maintenance schedule recommended by the manufacturer.

Another possible cause could be using low-quality fuel. Always make sure to use high-quality fuel from reputable gas stations.

Audi engines are also prone to carbon buildup, which can affect performance. Regularly using fuel system cleaning products can help prevent this.