Base oils are lubrication oil produced by refining crude oil or through chemical synthesis. Base oil has four vital physical properties, namely viscosity limitations and viscosity index, pour point, volatility, and aniline point, that determine how they will perform in service. Motor oil contains approximately 75% of base oil. The base oil helps to protect the bearings, piston rings, and other engine parts that require continuous lubrication. For more info - https://straitsresearch.com/report/base-oil-market/