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Lubricant Viscosity Effects on Passenger Car Fuel Economy
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1975 by SAE International in United States
Annotation ability available
As part of General Motors effort to improve fuel economy, the effects of engine and power train lubricant viscosities were investigated in passenger car tests using either high- or low- viscosity lubricants in the engine, automatic transmission, and rear axle. Fuel economy was determined in both constant speed and various driving cycle tests with the car fully warmed-up. In addition, fuel economy was determined in cold-start driving cycle tests.
Using low-viscosity lubricants instead of high-viscosity lubricants improved warmed-up fuel economy by as much as 5%, depending upon the differences in lubricant viscosity and type of driving. Cold-start fuel economy with low-viscosity lubricants was 5% greater than that with high-viscosity lubricants. With such improvements, it is concluded that significant customer fuel economy gains can be obtained by using the lowest viscosity engine and power train lubricants recommended for service. To determine if currently recommended engine oil, automatic transmission fluid, and rear axle lubricant viscosities can be reduced, extensive performance and durability testing will be required.
CitationDavison, E. and Haviland, M., "Lubricant Viscosity Effects on Passenger Car Fuel Economy," SAE Technical Paper 750675, 1975, https://doi.org/10.4271/750675.
- “Automobile Fuel Economy.” Published by the Motor Vehicle Manufacturers Association, 320 New Center Building, Detroit, Michigan, 48202, September 21, 1973.
- Whitehouse J.A. and Metcalf J.A., “The Mechanical Efficiency of I.C. Engines-A Review of Published Information.” Report No. 1958/5, published by The Motor Industry Research Association (MIRA), Lindley, Nr. Nuneaton, Warwickshire, Great Britain.
- Towle A., “Some Problems in Lubrication and the Substances Called Additives.” The Institution of Mechanical Engineers, Proceedings of the Automobile Division, 1954-55, pp. 57-78.
- Dewdney D.A.C., Evans E.B., Heaton J.L., and Hunt K.C., “Lubricating Oils in the I.C. Engine.” 3rd World Petroleum Congress Proceedings, Sect 7, 1951, pp. 413-422.
- Chamberline W.B. and Sheahan T.J., “Automotive Fuel Savings Through Selected Lubricants.” Paper 750377 presented at SAE Automotive Engineering Congress, Detroit, February 1975.
- SAE Recommended Practice, Fuel Economy Measurement-Road Test Procedure-SAE J 1082, SAE Handbook.
- U.S. Department of Transportation-Federal Highway Administration, “Nationwide Personel Transportation Survey-Seasonal Variations of Automobile Trips and Travel.” Report No. 3, April 1972.
- Scheffler C.E. and Niepoth G.W., “Customer Fuel Economy Estimated From Engineering Tests.” SAE Transactions, Vol. 74 (1965), paper 650861.
- Ingamells J.C., “Fuel Economy and Cold-Start Driveability with Some Recent-Model Cars.” Paper 740522 presented at SAE Combined Commercial Vehicle and Fuels and Lubricants Meetings, Chicago, June 1974.
- McClintock R. and Osborne R.E., “The Effect of Lubricant Viscosity on Rear Axle Gear and Pinion Bearing Operation.” Lubrication Engineering, Vol. 20, No. 10 (October 1964), pp. 387-392.
- McClintock R., “Lubricant Effects of Rear Axle Tapered Roller Bearing Wear.” SAE Transactions, Vol. 78 (1969), paper 690778.
- Haviland M.L., Anderson R.L., Davison E.D., Goodwin M.C, and Osborne R.E., “DEXRON®-II Automatic Transmission Fluid Performance.” Paper 740053 presented at SAE Automotive Engineering Congress, Detroit, February 1974.
- Haviland M.L. and Davison E.D., “Automatic Transmission Fluid Viscosity Requirements.” SAE Transactions, Vol. 80 (1971), paper 710838.