Why does my Audi A5's engine make a loud knocking noise at high speeds?

I have noticed that when driving my Audi A5 at high speeds, the engine starts to make a loud knocking noise. It seems to go away when I slow down. What could be causing this and how can I fix it?

It's possible that the noise is coming from worn out engine bearings. Have a mechanic check them and replace if necessary. Additionally, make sure the oil level is correct and use high-quality oil for your engine.

The knocking noise could be due to a loose or broken engine mount. Have a mechanic inspect and replace if needed. Also, check for any loose engine components that may be causing the noise.

Another possibility is that the engine has a misfire, which can cause knocking sounds. Have the ignition system, spark plugs, and fuel system inspected and repaired if necessary.