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Testing of Engine Oils Having Carryover Fuel Economy Effects
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English
Abstract
Evaluation of the fuel economy characteristics of engine oils requires a rigorous test design. Side-by-side test designs, though adequate for evaluating the control of deposits, wear, and viscosity, require too many cars for precise fuel-economy testing. Crossover, Latin-square, and other balanced-block designs cannot be used if the fuel economy oil shows “carryover” effects; that is, if the engine is conditioned by the fuel economy oil so that subsequent oils still show a residual fuel economy benefit.
The most suitable test design is a sequential one. The reference oil is run until it demonstrates a constant level of fuel economy. The test oil is then run for enough miles so that its full effect has been reached. The comparison is made between the two stabilized levels. Examples are given for an SAE 10W-40, API SF oil, which showed a 4+ % fuel economy improvement in both fleet and EPA type chassis-dynamometer sequential-design tests.
A “deconditioning oil” technology is currently being evaluated. The fuel economy of a vehicle is determined on a reference oil and a fuel economy oil in a sequential manner. The vehicle is then run for a short period on the deconditioning oil, which removes any friction-reducing films from the rubbing surfaces, and restores the engine to its original reference oil fuel economy level. If successful, this deconditioning technology will greatly reduce the time and cost of fuel economy testing.
Authors
- Walter E. Waddey - Products Research Division, Exxon Research and Engineering Co.
- Barry C. Deane - Products Research Division, Exxon Research and Engineering Co.
- Harold Shaub - Products Research Division, Exxon Research and Engineering Co.
- Robert A. Carley - Marketing Technical Services, Exxon Company, U.S.A.
Topic
Citation
Waddey, W., Deane, B., Shaub, H., and Carley, R., "Testing of Engine Oils Having Carryover Fuel Economy Effects," SAE Technical Paper 810317, 1981, https://doi.org/10.4271/810317.Also In
References
- 42 126 June 30 1977
- Waddey W. E. Shaub H. Pecoraro J. M. Carley R.A. SAE Paper 780599 , Troy Michigan June 1978
- Davison E.D. Haviland M.L. SAE Trans. 84 1595 1975
- Goodwin M.C. Haviland M.L. SAE Trans. 87, 2206 1978
- Lonstrup T. F. Bachman H. E. Smith C.R. SAE Paper 790949 Houston, Texas October 1979
- Broman V. E. Dejovine J. DeVries D.L. Keller G.H. SAE Paper 780597 , Troy Michigan June 1978
- Ghirla P.J. Smith R.K. SAE Paper 780984 Toronto, Ontario November 1978
- Richman W. H. Keller J. A. SAE Paper 750376 Detroit, Michigan February 1975
- Chamberlin W. B. Sheahan T. J. SAE Paper 750377 Detroit, Michigan February 1975
- Krulish J. A. C. Lowther H .V. Miller B. J. SAE Paper 770634 Tulsa, Oklahoma June 1977
- Marshall E. F. CRC Report No. 502 December 1978
- SAE Recommended Practice SAE J183 February 1980
- Caracciolo F. McMillan M. L. SAE Paper 790728 Dearborn, Michigan June 1979
- Haviland M. L. Goodwin M. C. SAE Paper 790945 Houston, Texas October 1979
- Retzloff J. B. Davis B. T. Gluckstein M. E. Pietras J. M. ASLE Preprint No. 79-AM-2C-1 April 1979
- McDonnell T. F. Tempe S. A. SAE Trans. 87, 1597 1978
- Jones E. R. Painter L. J. SAE Paper 790951 Houston, Texas October 1979
- McDonnell T. F. Farnsworth G. R. Langan H. A. Sara F. SAE Paper 810318 Detroit, Michigan February 1981
- Okrent E. H. ASLE Trans. 4, 97 1961