What is the best way to maintain a Ford Galaxy's engine performance?

I recently purchased a Ford Galaxy and I want to make sure its engine remains in good condition. What steps should I take to ensure its performance stays at its peak?

Check and replace the air filter every 15,000 miles to optimize air flow and fuel efficiency.

Keep an eye on the coolant level and add more as needed to prevent overheating.

Regularly change the oil and filter according to the recommended schedule.