The recent developments inμ-EHL have provided useful information on the local behavior of EHL films and pressures induced by asperity interactions. With the help of this information it has been easier to explain the failure mechanisms like pitting and scuffing in concentrated lubricated contacts [2,3]. In μ-EHL contacts the breakdown of EHL films depends on three major aspects, (i) roughness characteristics and resultant asperity interaction of surfaces, (ii) type of lubricants and their viscoelastic behavior and (iii) rheological behavior of lubricants