In college I changed my oil and filters. It was a pain getting under a car a few inches off the ground, disposal was tricky, and I had to spend time cleaning up nasty gunk. I also could only do it when the car had not been driven recently.

The fundamental problem with changing your oil is that it involves oil. I saved $30, at the cost of an hour of my labor. As soon as I had a job, that equation didn't make sense.

I did the same thing on a late 90's 3 series throughout college. A pair of car jacks or rhino ramps makes the job way easier. Also if you take your oil to pep boys they'll dispose of it for free. Either way I'd still do it if I didn't live in a city. There's something nice about maintaining your things, it brings pride in ownership.

I now have a much newer car (that I probably don't need since I don't need to drive to work and live in a city) and no garage so I pay for oil changes. On the college car I knew how everything fit together, I took everything apart to fix it multiple times, I changed/ upgraded/ retrofitted things in their to make it more enjoyable. On my new car I can't really do those things without more complicated tech. It definitely changes how you view the object. Both are fun "tools" but one was my fun tool the other isn't

Not even $30 as the cost of the filter and oil (not to mention tools and ideally things to make it safer like ramps or jackstands)...