How often should I change the spark plugs on my Kia Rio?

I've heard that changing the spark plugs regularly can improve the performance and fuel efficiency of my Kia Rio. How often should I change them and what are the signs that indicate they need to be replaced?

It is recommended to change the spark plugs every 30,000 miles or every 3-5 years, whichever comes first. Signs that indicate the need for replacement include difficulty starting the car, poor acceleration, and decreased fuel efficiency.

As someone who has owned a Kia Rio for several years, I suggest changing the spark plugs every 40,000 miles. However, if you notice a decrease in performance, it may be time to change them sooner.

I personally change my spark plugs every 50,000 miles and have not had any issues with my Kia Rio's performance. It's always a good idea to follow the manufacturer's recommendations, but ultimately, it's up to personal preference.

I have been a mechanic for over 10 years and I highly recommend changing the spark plugs every 30,000 miles. Neglecting to do so can lead to more expensive repairs in the long run.