How often should the spark plugs in the 2019 GS5 be replaced? It's approaching 70,000 kilometers and hasn't been changed yet.

It's best to take it out and check. If the wear is severe, just replace it.

I haven't changed my over 70,000 yet.

If you're having trouble starting the car or notice unstable RPMs, just check it first. You can replace it later if needed. I've driven 100,000 km without changing it.

I changed it when it reached 40,000.