I don't quite agree with the economic assessment, as I need the jack, jack stands, wrench for the drain plug, etc. for other maintenance and repair tasks, too.

I don't quite agree with the economic assessment, as I need the jack, jack stands, wrench for the drain plug, etc. for other maintenance and repair tasks, too. The only single-purpose tool is the oil filter wrench, and that was about $10. Can't argue with your bottom line, though. Even if I consider my time free, I don't really come out ahead. But - I like changing oil in my car. I get to see the oil as it drains out, the color of it, if it's the amount I expect to see, or if the car's burned some since the last change. It's an excuse to look around under the car and notice if there's any unexpected damage. It just feels good to personally take care of a piece of the infrastructure I depend on. I think there's one other big advantage of your way, though: you're maintaining a relationship with a mechanic who you trust.