SYMPOSIA PAPER Published: 01 January 2008
STP45624S

No/Low SAP and Alternative Engine Oil Development and Testing

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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, Germany
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Details
Developed by Committee: D02
Pages: 35–47
DOI: 10.1520/STP45624S
ISBN-EB: 978-0-8031-6252-5
ISBN-13: 978-0-8031-4505-4