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Effects of Lubricant Composition on Fuel Efficiency in Low-Friction Engines
Published October 04, 1994 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
A bench engine test for evaluating the fuel efficiency of automotive crankcase oils using low-friction engines was developed. The fuel consumption was primarily proportional to the viscosity of the oils down to 5mm2/s, indicating that the use of low-viscosity oil was effective in improving fuel efficiency. This may be because the oil film would be formed easily, since sliding parts, such as valve train systems, in low-friction engines are finely finished. A 2.7% improvement in fuel efficiency relative to conventional SAE 10W-30 oils was achieved by the combination of low-viscosity SAE 5W-20 oils and MoDTC-type FMs.