The majority of crankcase lubricants are now formulated to contain polymeric additives to improve the viscosity temperature properties to provide a better lubricating film in the various bearing systems in an internal combustion engine. These VI (viscosity index) improved lubricants are non-Newtonian under the high shear conditions that exist in most automotive bearing systems. The conditions of interest range from starting the engine at temperatures of as low as -40°C to operating the engine at normal operating conditions including bearing temperatures of 150°C or higher. This paper presents a method for predicting the viscosity shear relationship for a series of SAE multigrade engine oils as a function of temperature and shear stress. The method is demonstrated using three types of polymeric VI improvers currently used in SAE multigrade engine oils. The polymer types include olefin copolymers (OCP), polymethacrylates (PMA), and styrene-isoprene copolymers (SI).


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Predicting Viscosity-Shear Relationships of VI Improved Lubricants


    Additional title:

    Sae Technical Papers


    Contributors:
    Chen, C. I. (author) / Klaus, E. E. (author) / Duda, J. L. (author) / Wu, P. (author)

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1994



    Publication date :

    1994-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Predicting viscosity-shear relationships of VI improved lubricants

    Chen,C.I. / Wu,P. / Duda,J.L. et al. | Automotive engineering | 1994


    Measurement and analysis of high-shear viscosity of polymer-containing lubricants

    Lee,F.L. / Klaus,E.E. / Duda,J.L. et al. | Automotive engineering | 1988


    Viscosity reduction of driveline lubricants

    Froböse, Eric / Murr, Torsten | Tema Archive | 2012


    Viscosity reduction of driveline lubricants

    Froboese,E. / Murr,T. / Deutsche Shell,Hamburg,DE | Automotive engineering | 2012


    Viscosity reduction of driveline lubricants

    Frobose, E. / Murr, T. | British Library Conference Proceedings | 2012