I haven't posted much - sorry for that. But I enjoy reading and have gained much from the forum. My time is consumed with commuting to/from work and taking care of family. I plan post photos of my 05 ion3 one day. Still haven't done sway bar bushings -
I use my oil life system. Sw2cam is right, the owners manual outlines how to use it. the CHG OIL msg goes off in the display every 6-7k for me. I do mix of city and hwy driving.
But I stretch it since I use Castrol synthetic. I go about 8k.

It's just krazy the kind of info they put in the owners manual. I've even see things about what light bulbs fit in what light bulb socket. Imagine that if you can.

Dang that's in there?