How to preserve the longevity of my Audi 80's engine?

I recently purchased a used Audi 80 and I want to make sure its engine stays in good condition for as long as possible. What steps should I take to maintain its longevity?

Regularly change the engine oil and oil filter every 5,000 miles. This will keep the engine well-lubricated and prevent unnecessary wear and tear.

Keep an eye on the engine's coolant levels and make sure to top up when needed. A well-maintained engine should have a consistent level of coolant at all times.