Typically, industrial lubricants contain 70-90% base oils and the rest are additives. Base oils impart primary vital properties of the lubricant such as viscosity, viscosity stability, thermal stability, solvency, low temperature flow and volatility, and oxidation stability.
On the basis of the refining method and key base oil properties such as viscosity, amount of saturates and sulfur content, the American Petroleum Institute (API) has classified base oils into five major groups - Group I, Group II, Group III, Group IV and Group V. Finished products application is most often determined by specifications of each of these groups.
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