Volume 4, Issue 10 (November 2007)

    No/Low SAP and Alternative Engine Oil Development and Testing

    (Received 12 January 2007; accepted 1 November 2007)

    Published Online: 2007

    CODEN: JAIOAD

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    Abstract

    The use of alternative base oils, like esters or polyglycols, with more intrinsic properties for the lubrication of automobile engines has a potential for ecological and technical advantages. Being in competition with hydrocarbon-based formulations, detailed knowledge of several thermophysical and viscometric properties as well as tribological properties over a large temperature range are required (mapping). The tested polymer-free polyglycols and ester-based formulations displayed no visible tribological weaknesses regarding wear resistance and EP-behavior as well as offering significant advantages in order to meet metal- and ash-free and bio-no-tox criteria. Especially the formulated polyglycols without friction modifiers also showed an intrinsic retention of low coefficients of friction and a hydrodynamic film forming behavior comparable to hydrocarbon-based factory-fill oils. The wear resistance and EP-behavior of low-additivated polyglycols, but also of esters, can be enhanced by means of triboactive materials. Lubricious oxides or triboactive materials and polar base oils, or a combination thereof, may substitute the EP and AW properties realized by the additives, thus enabling long drains and responding to “eco-tox” or “bio-no-tox” requirements as well as restrictions from the “chemical box.”


    Author Information:

    Woydt, Mathias
    Federal Institute for Materials Research and Testing (BAM), Berlin


    Stock #: JAI100898

    ISSN: 1546-962X

    DOI: 10.1520/JAI100898

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    Author
    Title No/Low SAP and Alternative Engine Oil Development and Testing
    Symposium Automotive Lubricant Testing and Additive Development, 2006-12-05
    Committee D02