What should I do to keep my Audi A3 engine running smoothly?

I recently purchased an Audi A3 and I want to make sure that its engine remains in good condition. What maintenance tasks should I regularly do to ensure the engine runs smoothly and efficiently?

Regularly change the engine oil according to the manufacturer's recommended schedule to prevent any build-up of contaminants and protect the engine's components.

Don't forget to check and replace the air filter when necessary. A clogged air filter can reduce engine performance and increase fuel consumption.