What are the common problems with the Audi 80's engine?

I recently bought a used Audi 80 and I've been experiencing some issues with the engine. I want to know what are the common problems with the engine so I can address them.

Hi John, it's important to regularly check the engine oil level and replace it every 5,000-7,500 miles. Other common issues with the Audi 80's engine include faulty spark plugs, worn out belts, and clogged air filters. Make sure to keep up with regular maintenance and address any potential issues as soon as possible. It also helps to use high-quality fuel and avoid aggressive driving.