A lubricant is a substance introduced to reduce friction between surface in mutual contact, which ultimately reduces the heat generated when the surfaces moves. The property of reducing friction is known as lubricity. Lubricants are generally composed of a majority of base oil plus a variety of additives to impart desirable characteristics is called as Lubricant oil. Lubricants performs keep moving parts apart, reduce friction transfer heat, carry away contaminants and debris, transmit power.