I put cooking oil in my engine 10 years ago and I've not had an oil leak to this day, despite never even replacing the filter. That's right - the oil in my car is 10 years old.

Convince me that motor oil isn't a scam to make us buy more cars.
>Protip; you can't.

If you think this is b8:
https://www.youtube.com/watch?v=7LkEmTYE2DA