True story here. Years ago my next door neighbors wife was off to Dallas to see mom. He told her to stop at the parts house + get a qt. of oil. She did. When she started to put the oil in the radiator the owner rushed out + did it for her correctly.
When I was first married, I told my wife, "if you're gonna drive one of these things, you're gonna know a little about it." I taught her how to check the oil, where to put it if she was low, etc. I even painted her positive battery post red. I would do most of the work but it was her job to keep track of the maintenance schedule. If she told me she needed her oil changed and I wasn't quick enough to suit her, off to the service station she'd go.