Sometimes the real world is even scarier than fiction.
My sister bought a brand new car off the dealers lot.
She knew it had an oil light.
so she drove it till the oil light came on thinking that it was there to tell her when to get an oil change. She went 25,000 miles on the factory oil. when the oil light came on she called the dealer and made an appointment for an oil change. drove it another few days with the oil light on till the appointment.
t6his was back in 1974, $600 later she got the car back with a new cam, and all of the valve train replaced. The mechanic told her to sell the car quick because the bearings were probably shot too.
We did make her go and take a basic auto care course at the local tech collage.