> I change my own oil also, but I have no rational explanation for this choice.
Of course you do. All the items you listed are a small, one time cost. Watch a YouTube video, buy the wrench, pan, and funnel ($50?). The “knowledge” of which oil to use takes 20 seconds to look up in the manual in the glove box of the car. And the disposal is pretty easy, you take the empty oil bottles, fill them back up with old oil, and dump it at Autozone.
And for this initial, let’s say 1 hour of work for procurement, you get to guarantee that the oil change on your car (which represents a significant portion of the average American’s wealth) is done properly, with zero risk of it going wrong.
Now, there is nothing objectively wrong with NOT wanting to do this and just preferring to pay someone else. But for a household with 2 ICE cars that they own for 10+ years, this is very little work for a lot of gain, and watching 1 less Netflix show is probably not going to hurt. The tools for for all of this also take a small space to store.
Which is why I do not consider it a “no brainer” to outsource oil changes.
> Of course I use better oil and filters than the shop would. Does this matter?
Why would it not if you intend on driving the car for 200k miles? My main concern is some minimum wage mechanic not doing the oil change properly. I know they are not getting paid enough to care, and if I have to stop and check to see if it was done properly, I might as well do it myself.