A method for determining the parameters of the rheological properties which express the model of the limiting shear stress of lubricants is proposed. The relationships between the traction coefficients of the roller tests and the mean film temperature rises of lubricants are calculated. The maximum traction coefficients are revised to those of the isothermal condition by the traction coefficient-temperature relationships and analyzed using an approximate formula which estimates a maximum traction coefficient based on the limiting shear stress. The zero pressure value of limiting shear stress To and slope of the limiting shear stress-pressure relationship m are presented for two traction fluids Santotrac 50 and Daphne 7074 at temperature 313 K. Maximum traction coefficient and limiting shear stress at high temperature are predicted using the traction coefficient-temperature relationships.