Title: Fundamental evaluation of fuel-efficient engine oils

Authors: Y. Tsukawald, S. Iwamoto, A. Nishiyama, T. Tanioka

Addresses: Technology Development Div., Toyo Kogyo Co. Ltd, Huoshimashi, Japan. ' Technology Development Div., Toyo Kogyo Co. Ltd., Huoshimashi, Japan. ' Engine Development Div., Toyo Kogyo Co. Ltd., Huoshimashi, Japan. ' Engine Development Div., Toyo Kogyo Co. Ltd., Huoshimashi, Japan

Abstract: Fundamental laboratory tests on fuel efficient engine oils were run to study how to select base oils and friction modifiers. Reliability of those oils was evaluated on the engine through tests on fuel economy, valve train war, detergency, etc. The 7.5W-30 (the viscosity of 18 poise or lower in the range of SAE viscosity Dade 1OW is rated M 7.5W in Japan; 7.5W-30 corresponds to 1OW-30 in SAE J300 Standards) having suitable base oils and blended with some friction modifier exhibited 3% fuel saving in the Japanese 10-mode fuel economy test as compared with a 1OW-40 oil containing no friction modifier. It was also observed that possible negative effects of a viscosity-reduced and friction modified oil, such as increase in wear, corrosion and oil consumption, decreased detergency, and catalyst deterioration by P poisoning, can be eliminated by oil formulation (selection of base oils and friction modifiers).

Keywords: fuel-efficient engine oils; friction modifiers; viscosity reduction; detergency.

DOI: 10.1504/IJVD.1984.061104

International Journal of Vehicle Design, 1984 Vol.5 No.4, pp.438 - 450

Published online: 25 May 2014 *

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