Natural oils are a type of lubricant used in engines that are made from natural raw materials, usually plant or animal sources. These oils are often popular for their exceptional lubrication properties and resistance to high temperatures. Although they can be more expensive than their synthetic or mineral counterparts, their superiority in certain applications such as high temperature lubrication can justify the higher cost. In addition, natural oils are often considered a greener alternative because they are biodegradable and renewable. However, not all engine types are suitable for use with natural oils, so it's important to consult a professional or check your vehicle's manual before using them.