I change the oil and filter on my 2021 Kia K5 every 6000 km. I just changed it this morning. The oil is usually black but after draining the filter the paper pleats are still a honey colour and there is no damage to the filter. The last few times I have changed the oil I have contemplated reusing the filter but have chickened out. I know that people will say to change both as the filter is only a few bucks more. But it is not. The oil filter is $15 to $20 dollars at the stealership and only a little bit less on Amazon in Canada. It has a 1.6 turbo GDi engine What do you think?