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.


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    Titel :

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


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Tom West, C. (Autor:in) / Liesen, Gregory P. (Autor:in) / Devlin, Mark T. (Autor:in) / Li, Shoutian (Autor:in) / Jao, Tze-Chi (Autor:in)

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 2000



    Erscheinungsdatum :

    16.10.2000




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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