What are the most common issues with Audi's engine and how can they be fixed?

I recently bought an Audi and I've been experiencing some issues with the engine. I've tried researching, but I can't seem to find a comprehensive list of common issues and their solutions. Can anyone provide some insight?

One common issue with Audi's engines is carbon buildup, which can cause misfires and decreased performance. To fix this, it's important to regularly clean and maintain the engine, as well as add fuel additives to prevent buildup.

Another issue is oil consumption, which can be caused by faulty piston rings or valve seals. It's important to regularly check and change the oil, as well as address any underlying issues with the engine components.