[mirimir]

Well, I was just being pedantic, I suppose.

But it's arguably not such a great example, because details of engine design are generally trivial for drivers. Maybe a better example is the low oil pressure indicator. Maybe most people don't know what that actually means, but not having one can lead to severe engine damage. Years ago, I had a car with an oil radiator, and the oil line failed. So I knew to stop immediately.