A novel non-phosphorus antiwear additive, NP-1, was evaluated as a partial substitute for zinc dialkyldithiophosphate (ZDTP). ZDTP, an antiwear/antioxidant engine oil additive may under certain conditions cause three way catalyst (TWC) deactivation due to formation of an amorphous zinc pyrophosphate, Zn2P2O7, glaze. Antiwear and antioxidant properties of NP-1 alone and in combination with ZDTP were compared with ZDTP only containing formulations. The effects of NP-1 on TWC activity during pulsator modulation and steady-state conditions showed that the TWC maintained good overall activity during 24,000 simulated miles.


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    Title :

    Use of a Novel Non-Phosphorus Antiwear Additive for Engine Oils


    Additional title:

    Sae Technical Papers


    Contributors:
    Chasan, D. (author) / Beckwith, E. C. (author) / Gandhi, H. S. (author) / Perry, J. (author) / Müller, K. (author) / Kristen, U. (author)

    Conference:

    1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1987



    Publication date :

    1987-11-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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