Lowest engine oil while the car was actually still driving would have to be a car me and some friends witnessed while on the freeway here in Houston ,an old man in his old stationwagon oblivious to everyone trying to get his attention ,his vehicle was plumming a smoke trail miles ahead ,this much like you would see from a steam locomotive ,it was late in the evening and when we got along side the car the underneath was glowing from the exhaust being cherry red hot .If she reaches this point you can say something , something about the weather being hot.