What is the most efficient way to maintain the performance of the engine in an Audi car?

I have been noticing a decrease in the performance of my Audi car lately. What steps can I take to maintain its engine and ensure it continues to run smoothly? Any tips or tricks would be greatly appreciated.

Start by regularly checking and replacing your engine oil according to the manufacturer's recommendations. This will help keep your engine running smoothly and prevent any potential damage in the long run.

Make sure to also check the air filter and replace it if needed. A clogged air filter can affect the engine's performance and decrease fuel efficiency.

Consider using a fuel system cleaner every few thousand miles to remove any build-up and improve fuel efficiency. But be sure to choose a cleaner that is compatible with your Audi model.