What is the most cost-effective way to maintain my Audi 80's engine?

I just got an Audi 80 and I want to make sure I am keeping up with proper maintenance to avoid any costly repairs down the road. What are some practical and affordable ways to maintain my engine?

Regular oil changes are key! Make sure to use high-quality oil and replace it every 5,000 miles. Not only will this keep your engine running smoothly, but it can also improve fuel efficiency.

Another important step is to regularly check and replace your air filter. This will help keep debris from entering your engine and can improve overall engine performance.

Invest in a fuel system cleaner and use it every 3,000 miles. This will help keep your fuel injectors clean and prevent any build-up that could lead to engine problems.