INTRODUCTIONLubricants play an important in reducing the wear and the friction and in increasing the life of contacting surfaces. Additives are used to supplement the limitations of lubricants and to enhance the performance of base oils. These anti-wear additives, extreme pressure additives, detergents, antioxidant, dispersants, and viscosity improvers are examples of lubricant additives.The operation of machines and industrial gears under severe conditions necessitated the development of lubricants that were operated at high temperatures and pressures. Due to excessive increases in temperature under extreme conditions, the boundary film of the fluid lubricant collapses leading to adhesion and surface damage of sliding metallic surfaces. Under such conditions, the friction and surface damage can be minimized by the use of certain extreme pressure EP and antiwear AW additives 1 .
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