What is the most efficient way to maintain the engine of an Audi A4?

I recently bought an Audi A4 and I want to keep the engine running smoothly for as long as possible. How can I efficiently maintain the engine without overspending?

Regularly change the engine oil as per the manufacturer's recommended schedule. This will help to keep the engine's components well-lubricated and extend its lifespan.

Invest in a high-quality air filter for your Audi A4. A clean air filter will ensure that your engine is receiving a steady flow of clean air, preventing any damage from dirt or debris.