The boiling point of motor oil is very high, about 572 degrees Fahrenheit. This property is due to its molecular structure.
Most motor oils have long carbon chains of 36 carbon atoms, which gives the oil its high boiling point. Since motor vehicle engines are subject to a wide range of conditions, it is necessary for lubricating oils to remain stable in liquid form across a wide temperature range. The molecules are non-polar, meaning they do not carry either a negative or a positive charge. Combined with the amount of variation between the various hydrocarbons, it means that motor oil does not freeze.