An early seventies Fiat 850. The
oil pan was aluminum; the drain plug steel. The threading was the reverse of what you would expect and, sure enough, within a few months of purchasing the car the threads were stripped. I replaced the plug with a flexible unit that was put in place, pull a short lever to apply pressure to the plug, holding it in the pan. This method did not enocourage confidence.
I soon learned that Fiat is also an acronym.