Research on Low-Friction Properties of High Viscosity Index Petroleum Base Stock and Development of Upgraded Engine Oil

High viscosity index(HVI) petroleum base stock, with excellent temperature-viscosity characteristics, oxidation resistance, and low-evaporation properties, offers advantages as the base stock for high fuel economy engine oils, particularly because of its low-friction properties in the boundary and/o...

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Bibliographic Details
Published in:SAE transactions 1995-01, Vol.104, p.719-727
Main Authors: Nagashima, Takashi, Saka, Tsutomu, Tanaka, Hideki, Satoh, Takayuki, Yaguchi, Akira, Tamoto, Yoshitaka
Format: Article
Language:English
Subjects:
Coefficient of friction
Energy economics
Engines
Friction
High pressure
Lubricants
Petroleum
Stock market indices
Torque
Viscosity
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Summary:High viscosity index(HVI) petroleum base stock, with excellent temperature-viscosity characteristics, oxidation resistance, and low-evaporation properties, offers advantages as the base stock for high fuel economy engine oils, particularly because of its low-friction properties in the boundary and/or "E. H. L (Elastohydrodynamic Lubrication)" area due to its rheological characteristics. This research evaluated HVI base stock's low-friction properties. Upgrading the oil from 5W-30 to 5W-20 was also investigated. The friction properties of the HVI base stock were measured by a unit friction platform. The results show a 28% reduction in friction coefficient compared with the conventional, solvent refined oil, which is attributable to the high-pressure viscosity of the base oil. The prototype 5W-20 engine oil, (made with this base stock) with a view to meeting the ILSAC GF-2 standard now expected to be mandatory in the future has been shown to superior to the 5W-30 engine oil in saving fuel consumption, by about 1.8%.
ISSN:0096-736X
2577-1531