just quick story, that i am glad i change my own oil and take care of my car myself. i use hyundai with 9688 oil filter and always been fram, no problem with my high milage car (190,000 kms). i bought it at 144,000kms, change every 8,000kms or 9,000kms or so, no problem.
i also changed my ATF with motomaster low viscosity for my car once last year (NOT FLUSHED, JUST CHANGED ATF), idk if it helps, i hope it helps to get my car running longer than if i dont change them.
i did more maintenance to my car not just that, but i'm so glad that i did