They made the gas tank filler hole a smaller diameter for unleaded gas cars, so that the leaded nozzles wouldn't fit. https://uiobservatory.com/2010/how-intell

They made the gas tank filler hole a smaller diameter for unleaded gas cars, so that the leaded nozzles wouldn't fit. https://uiobservatory.com/2010/how-intelligent-design-saved-a-car-engine/#:~:text=Pumps%20for%20unleaded%20fuel%20were,catalytic%20converter%2C%20rendering%20it%20useless https://uiobservatory.com/2010/how-intelligent-design-saved-....