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The New Aviation Multiviscosity Oil, SAE 20W-50 for General Aviation
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English
Abstract
For the past two decades, since the introduction of the ashless dispersant aviation oils, the quality of these oils has remained relatively constant. These “single grade” aviation oils, however, required changing as the weather changed whether the usual 50 hours of service has been accumulated or not. In fact, there have been frequent reports of aircraft engines being ruined because heavy SAE 50 (Commercial Grade 100) oils were in the crankcase when they were started and operated in cold weather without engine pre-heat. Present modern aircraft can easily fly from a cold area, with a light SAE 30 (Commercial Grade 65) oil in the crankcase, to a hot area and experience high wear due to boundary lubrication conditions and high oil consumption.
With the development of shear stable, heat resistant viscosity index improvers such as butadiene-styrene co-polymers, an excellent new generation SAE 20W-50 general aircraft oil which meets the requirements of Avco-Lycoming Specification 301F and Teledyne Continental Specification MHS-24B, is now being used commercially.
Over two years of successful field service from the Artie to the tropics has proved the concept of the multigrade general aviation oil, SAE 20W-50.
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Authors
Citation
Mengelkamp, R. and Yochum, K., "The New Aviation Multiviscosity Oil, SAE 20W-50 for General Aviation," SAE Technical Paper 810573, 1981, https://doi.org/10.4271/810573.Also In
References
- Bransford C. K. Poitz H. A. “What Can Be Gained With Additive Oils In Utility Aircraft Engines.” Paper 781C presented at the Automotive Engineering Congress Detroit, Michigan January 1964
- Lubricating Oil Recommendations, Avco-Lycoming Service Instruction No. 1014G, dated December 1 1978
- Military Specification Lubricating Oil, Aircraft Piston Engine, (Ashless Dispersant) MIL-L-22851C January 2 1979
- Streets W. L. Yochum K. H. Bill Mitacek “Evaluation of a Butadiene-Styrene Viscosity Index Improver.” Society of Automotive Engineers Paper 760267
- Johnson T. W. 0'Shaughnessy M. T. “Measurement of Temporary and Permanent Shear With the Instron Capillary Rheometer.” Society of Automotive Engineers Paper 770377
- Alexander D. L. Rein S. W. “Temporary Viscosity Loss in Shear Stability Testing.” Paper 801390 presented at the Fuels and Lubricants Meeting Baltimore, Maryland October 20 23 1980
- Garrelts Weldon E. “Effects of Extended Oil Changes on Aircraft Piston Engine Wear and Oil Characteristics.” Paper 790629 presented at the Business Aircraft Meeting and Exposition, Century II Wichita April 3 6 1979