What maintenance is required for my Toyota Corolla's engine?

I recently purchased a used Toyota Corolla and want to make sure the engine stays in good condition. What routine maintenance is recommended for the engine and how often should it be done?

Regular oil changes every 3,000 to 5,000 miles are essential for keeping your engine running smoothly. You should also check your oil level and top off if needed every few weeks.

In addition to oil changes, it's important to also replace your air filter every 15,000 to 30,000 miles. A dirty air filter can decrease your engine's performance and fuel efficiency.

Don't forget about your spark plugs! They should be replaced every 30,000 miles. Old spark plugs can lead to rough idling and poor fuel economy.