Eight engine oils were evaluated in four GM vehicles in standard EPA fuel economy (FE), vehicle-dynamometer tests. The results were compared with the FE obtained with a standard ASTM reference oil (BC). The viscosity and the friction modification effects of engine oil on vehicle FE were quantified.Combined FE performance in the vehicles ranged from almost 2 percent improvement for an SAE 0W-10 oil, to over 1.5 percent poorer FE than the reference oil for an SAE 10W-40 oil. FE in three engines (3.1L, 3.8L, and 2.3L) showed a strong dependence on the viscosity of the oil (HTHS at either 100° or 150°C). This dependence was stronger during the city portion of the EPA test (lower temperatures) than the highway portion (higher temperatures). For the 5.7L engine no significant effect of oil viscosity on FE was observed although the highest FE seemed to be obtained at an HTHS (at 150°C) viscosity near 3.1 cP.All four engines responded strongly to both of the friction modifiers used in this study (an organic and a Mo-type). The average (over all engines) combined FE improved by 1.6% with the Mo friction modifier and by 1.5% with the organic friction modifier. The effect of both friction modifiers was higher for the highway portion of the test than for the city driving schedule.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Engine Oil Effects on Fuel Economy in GM Vehicles -- Separation of Viscosity and Friction Modifier Effects


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Fall Fuels and Lubricants Meeting and Exposition ; 1998



    Erscheinungsdatum :

    19.10.1998




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :



    Engine Oil Effects on Fuel Economy in GM Vehicles - Separation of Viscosity and Friction Modifier Effects

    Tseregounis, S. / McMillan, M. / Olree, R. et al. | British Library Conference Proceedings | 1998




    Simulated fuel dilution and friction-modifier effects on piston ring friction

    Smith, O. / Priest, M. / Taylor, R.I. et al. | Tema Archiv | 2006