How often should I change the spark plugs in my BMW 4 Series?

I've owned my BMW 4 Series for about 3 years now and I've never changed the spark plugs. How often should I change them and why is it important?

As a general rule, it is recommended to change your spark plugs every 30,000 miles or every 3-4 years. This ensures optimal performance and fuel efficiency in your BMW 4 Series.

If you notice a decrease in your car's performance, such as difficulty starting or a decrease in fuel efficiency, it may be time to change your spark plugs regardless of mileage.

For high performance BMW 4 Series models, it is recommended to change the spark plugs every 20,000 miles due to their increased power output and stress on the engine.