I haven’t read every post in this thread, so please move on if my comment is redundant!
Old used cars scare me, mostly because I’m not mechanically inclined at all. OP probably knows a great deal more than me. If so, disregard…
However, my cautionary tale…
My parents gave me their used Honda Civic when I was a younger adult. My dad was a mechanical engineer, so he had maintained it well. After a couple of years driving it, I made a long trip driving from Chicago to East Tennessee and back. Since I’m fairly ignorant about cars (and this one had around 120,000 miles on it) I took it to a Honda dealership before the trip and asked them to check everything that should be checked and to replace ANYTHING that should be replaced. I emphasized I was going on a long trip. They did a couple of minor tweaks and said I was good to go.
On the way back to Chicago, my timing belt broke and I had no idea what was happening… just that I suddenly had no breaks and no power at 75 MPH! Terrifying! I woke my passenger, who had the presence of mind to slowly pull my parking break while I steered to the shoulder. Fortunately, we were on a stretch of flat, uncrowded Indiana farmland. Had the belt broken forty miles earlier in the middle of Indianapolis or a few hundred miles earlier in the Appalachians we might well be dead.
The engine was destroyed but we felt very lucky!
When I told my mom, she said, "Oh, yes, Honda recommends replacing the timing belt at 100,00 miles! The Honda dealership I patronized seems to have not gotten that message.
The passenger is now my husband, and we prefer to buy new, with a warranty!
When and if we buy our daughter a car, it probably won’t be more than a couple of years old, if that, with a known history. No amount of savings is worth the risk to my kid’s life, or my peace of mind!