How to keep my Audi 80's engine in top condition?

I want to maintain my Audi 80's engine in the best shape possible to ensure its longevity and performance. What steps should I take and how often should I perform maintenance tasks? Any tips would be greatly appreciated.

Regularly change your engine oil and oil filter every 5,000 miles or every 6 months, whichever comes first. This will help keep your engine running smoothly and prevent any build-up of debris or contaminants that could harm your engine's internal components.

Check your coolant levels regularly and top up if needed. In addition, have your coolant changed every 2 years or 30,000 miles to prevent any damage from overheating. It's also advisable to have the coolant system checked for leaks every year.

Keep your spark plugs clean and replace them every 30,000 miles. Ignition system issues are one of the most common causes of engine problems, so don't neglect this part of your engine's maintenance.