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An Investigation into the Effect of Zinc Dithiophosphate on ASTM Sequence VIA Fuel Economy
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Abstract
The International Lubricant Standardization and Approval Committee (ILSAC) GF-2 specification requires Passenger Car Motor Oils to provide enhanced fuel economy in a modern low friction engine as measured by the ASTM Sequence VIA This paper details fundamental studies of the effect of zinc dithiophosphate, both type and level, on fuel economy as measured by this low friction engine The Sequence VIA was found to be very sensitive to both the level of zinc dithiophosphate and the type of alcohol functionality associated with it Increasing the level of zinc dithiophosphate was found to enhance fuel economy as measured by this test particularly in the SAE 10W-30 viscosity grade Secondary zinc dithiophosphates outperformed both primary and aryl types This paper will discuss these findings, as well as report on some fundamental studies using 31P-NMR and surface film analysis to determine the fate of zinc dithiophosphate during the course of this test
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Wilk, M., Abraham, W., and Dohner, B., "An Investigation into the Effect of Zinc Dithiophosphate on ASTM Sequence VIA Fuel Economy," SAE Technical Paper 961914, 1996, https://doi.org/10.4271/961914.Also In
References
- Chamberlin, W B “Looking Toward a New Dynomometer Test to Classify Energy Conserving Engine Oils,” NPRA Presentation 1985
- JAMA and AAMA “The ILSAC Minimum Performance Standard for Passenger Car Engine Oils.” 1990
- Martin F A “Friction in Internal Combustion Engine Bearings,” Combustion Engines - Reduction of Friction and Wear, International Tribology Conference London 1985
- Lang O R “Rebungsverluste in Verbrennungsmotoran” Trib u Schm January 29 1982
- Taylor C F The Internal Combustion Engine in Theory and Practice 1 2nd The MIT Press 312 361 1986
- Dohner, B R Wilk, M A “Formulating for ILSAC GF-2 - Part 2 Obtaining Fuel Economy Enhancement from a Motor Oil in a Modern Low Friction Engine,” SAE Paper 952343 1995
- Inoue, K Tominaga, E Akiyama, K Ashida, T “Effects of Lubricant Composition on Fuel Efficiency in Modern Engines,” SAE Paper 951037 1995
- Kennedy, S Moore, L D “Additive Effects on Lubricant Fuel Economy,” SAE Paper 872121 1987
- Coy, R C Jones, R B “The Degradation of Zinc Dialkyldithiophosphate Additives in Rigs and Engines,” Tribology, Key to the Efficient Engine Mechanical Engineering Publication Ltd London 17 1982 (b) Marshall G L “The Characterization of Additives and Associated Products Using 31 P Fourier Transform Nuclear Magnetic Resonance Spectroscopy,” Petroanalysis '81 Advances in Analytical Chemistry in the Petroleum Industry 409 1983 (c) Peng, P Hong S Z Lu, W Z “The Degradation of Zinc Dithiophosphate Additives in Fully Formulated Engine Oil as Studied by 31 P-NMR Spectroscopy,” Lubricant Engineering 50 230 1994
- Coy, R C Jones R B “The Thermal Degradation and EP Performance of Zinc Dithiophosphate Additives in White Oil,” ASLE Trans 24 77 1981 (b) Willermet, P A Kandah S K ‘Lubricant Degradation and Wear V Reaction Products of a Zinc Dithiophosphate and Peroxy Radicals” ASLE Trans 27 67 1984 (c) Paddy J L Lee, N C Waters D N “Zinc Dithiophosphate Oxidation by Cumene Hydrogenperoxide Kinetic Studies of Raman and 31 P-NMR Spectroscopy,” Tribology Trans 33 15 1990 (d) Al-Malaika, S “Antioxidant Mechanisms of Derivatives of Dithiophosphoric Acid,” Mech Polym Degrad Stab Scott, G Elsevier London, U K 61 1990
- Quantification of the unknown multi-thio containing decomposition by-products as well as the other ZDP degradation by-products underneath the ZDP peaks in the 31 P-NMR spectra for all four oils were determined using a proprietary method this method involves chemical treatment of the oil drain prior to re-analysis by 31 P-NMR spectroscopy
- Harrison, P G Kikabhai, T “Proton and 31 P Nuclear Magnetic Resonance Study of Zinc (II) O O'-Dialkyl Dithiophosphates in Solution,” Jour Chem Soc Dalton Trans 807 1987 (b) Harrison, P G Brown, P McManus, J “ 31 P-NMR Study in the Interaction of a Commercial Succinimide-type Lubricating Oil Dispersant With Zn(II) bis(O,O'-di-iso-butyldithiophosphate),” Wear 156 345 1992
- Bovington, C Spikes, H “Prediction of the Influence of Lubricant Formulations on Fuel Economy, from Laboratory Bench Tests,” Proceedings of the International Tribology Conference Yokohama, Japan 1995