A taxi field test in 1999 resulted in unusually high used oil MRV TP-1 viscosity in the first 16,000-kilometer drain oil. A subsequent root cause investigation revealed that contamination of the test oil by carry-over of the factory-fill oil followed by oil aging in the vehicle was responsible for the unusual high MRV TP-1 viscosity. Contamination by the factory-fill oil alone cannot account for the high MRV TP-1 viscosity; oil aging in vehicles is an essential co-factor. While the precise mechanism has not been determined, high MRV TP-1 viscosity and yield stress appear to be the consequence of reduction in PPD effectiveness but not PPD degradation. However, the MRV TP-1 viscosity and yield stress of such used oil can be restored to acceptable levels by an optimized PPD system. The study found that used oil MRV TP-1 pumping viscosity and yield stress can be highly dependent on the viscosity index improvers used in the oils involved. However, oil robustness can be enhanced by a rigorous field test protocol.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Low Temperature Rheology of Engine Lubricants: Investigation of High Used Oil Pumping Viscosity


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 2000



    Publication date :

    2000-10-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Low temperature rheology of engine lubricants: investigation of high used oil pumping viscosity

    Li,S. / Devlin,M.T. / Liesen,G.P. et al. | Automotive engineering | 2000


    Low Temperature Rheology of Engine Lubricants: Investigation of High Used Oil Pumping Viscosity

    Li, S. / Devlin, M. T. / Liesen, G. P. et al. | British Library Conference Proceedings | 2000


    Low temperature rheology of engine lubricants subjected to mechanical shear: viscosity modifier effects

    Covitch,M.J. / Weiss,J. / Kreutzer,I.M. et al. | Automotive engineering | 1998


    Rheology of Multigrade Engine Lubricants in High Deformation Rate Extensional Flow

    Hawkins, K. / Barrow, M. S. / Williams, P. R. et al. | SAE Technical Papers | 2003


    Rheology of multigrade engine lubricants in high deformation rate extensional flow

    Cordy,S. / Barrow,M.S. / Brown,S.W. et al. | Automotive engineering | 2003