STP1501

    No/Low SAP and Alternative Engine Oil Development and Testing

    Published: Jan 2008


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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.”

    Keywords:

    ester, polyglycol, PAG, PPG, factory fill, hydrocarbon, engine oil, bio-oils, eco-lubricants, EAL, bio-no-tox oils, heat capacity, density, viscosity, pressure-viscosity, thermal conductivity, mixed, boundary, lubrication, low sap, mid sap, wear, friction, triboactive materials


    Author Information:

    Woydt, Mathias
    Federal Institute for Materials Research and Testing,


    Paper ID: STP45624S

    Committee/Subcommittee: D02.B0

    DOI: 10.1520/STP45624S


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