Ehh. Maybe I came off like a dick. Sorry about that.
My mom is like this. I remember as a kid one time my bike chain fell off, and I asked for help repairing it. She had no idea what to do. All that had to happen was the back tire had to be pushed forward so that chain could fit around the sprockets.
As I’ve grown older, and learned more about her, I learned she’s never owned a pedal bike as an adult. She knew how to ride one, but had no clue how to fix one. I see my mom as similar to this wife in question. Pouring oil on top of the car really exemplifies automobile illiteracy, but she’s never been educated, and is probably so uneducated she doesn’t know that she doesn’t know.