How to maintain and extend the life of your Audi A2's engine

As we all know, our beloved Audi A2s have a reputation for being reliable and long-lasting, but like any engine, they still require regular maintenance to ensure they continue to run smoothly. I'd love to hear from owners who have successfully maintained their engines, what checks do you perform regularly, are there any specific tips or recommendations that have helped extend the life of your A2's engine?