Not the current one, that was Yamani,
https://en.wikipedia.org/wiki/Ahmed_Zaki_YamaniI agree that the the price of oil is more likely to increase. It's common sense: The oil companies prefer to develop the cheapest (simplest, most accessible) fields first, so every time a field empties they replace its output with oil from a more expensive field, or not if the new field seems too expensive at the current price level.
But that doesn't that indebted car owners are safe. Oil producers can't cut production all that much (geology doesn't work that way) so the price can certainly drop in the short term. A few years later it'll have increased again, but in the meantime the bank might have impounded the car.