I get tired of the mundane stuff on the family cars and tired of doing a job over on any car. The redo is usually my own fault, and that makes it worse 😉
I was happy to find a local place that does full synthetic oil changes for just north of $50. By the time you factor in time (including recycling) and materials, it's about a wash. I still do them on the Mustang, but the shop gets the others.