years ago, when I was about 7 or 8 my mom had a Datsun 120Y in South Africa and she drove I would say about 20 miles with out any oil, the sump plug had fallin out. She noticed the oil light comming on, but did not want to stop in a dodgy place. My brother-in-law filled it up with oil and it run fine for another 5 years before she sold it.