How do I know if my BMW X3 needs a tune-up?

I've noticed my BMW X3 has been idling rough and has decreased fuel efficiency. I heard that getting a tune-up can improve engine performance, but how do I determine if my car actually needs one? What are the signs to look out for?

If you're experiencing issues with your car's engine such as rough idling or decreased fuel efficiency, it's a good idea to get a tune-up. These signs can indicate that your spark plugs need replacing or your engine components could benefit from some maintenance.

I've been driving BMWs for years and typically, I get a tune-up every 30,000 miles to ensure my car is running at its best. If your BMW X3 has hit that milestone or if it's been a while since your last tune-up, it's worth considering.