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The Effect of Ashless Antioxidants Type on Friction Reduction Durability on Engine Oils Containing MoDTC
Technical Paper
2006-01-3415
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The addition of molybdenum dithiocarbamates (MoDTC) to engine oils improves the fuel economy of vehicles. This efficiency is gradually reduced with the depletion of MoDTC and zinc dithiophosphates (ZnDTP) due to oil oxidation. Recent engine oils need more antioxidants than before to fulfill the requirements demanded for oxidation stability, which may influence the duration of friction reduction. Because of this fully formulated oils containing MoDTC were aged and evaluated with engine tests to determine the effect of ashless antioxidants type on friction reduction durability. It revealed that friction reduction durability was strongly influenced by various kinds of antioxidants and hindered phenol (PHE) suppressed the extinction of MoDTC and ZnDTP to retain a low friction property that was two times more stable than diphenylamine. Otherwise, high oxidation stability did not necessarily relate to a long duration of friction reduction. Engine oils containing PHE and MoDTC are revealed to have a long duration of friction reduction with GF-4 performance oxidation stability.
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Yoshida, S. and Naitoh, Y., "The Effect of Ashless Antioxidants Type on Friction Reduction Durability on Engine Oils Containing MoDTC," SAE Technical Paper 2006-01-3415, 2006, https://doi.org/10.4271/2006-01-3415.Also In
References
- Korcek S. Nakada M. “Engine Oil Performance Requirements and Reformulation for Future Gasoline Engines and Systems,” SAE Paper 961146 1996
- Tseregounis S. McMillan M. “Engine Oil Effects on Fuel Economy in GM Vehicles - Separation of Viscosity and Friction Modifier Effects,” SAE Paper 982502 1998
- Muraki M. Wada H. “Frictional Properties of Organo Molybdenum Compounds in the Presence of ZnDTP under Sliding Condition (Part 1),” J. Japanese Society of Tribologists 38 10 919 1993
- Yamamoto Y. Gondo S. “Friction and Wear Characteristics of Molybdenum Dithiocarbamates and Molybdenum Dithiophosphate,” Tribology Trans. 32 2 251 257 1989
- Yaguchi A. Inoue K. “Development and Field Performance of Fuel Efficient SAE 5W-20 Oils,” SAE Paper 952341 1995
- Akiyama K. Ueda F. Kurano K. Kawai H. Sugiyama S. “Development of Fuel Economy 5W-20 Gasoline Engine Oil,” JSAE Paper 9740109 1997
- Korcek S. ensen R.J Johnson M. Clausing E. “Antioxidant Reactions of Engine Oil Additive Systems Containing Friction Modifiers,” Proc. of the International Tribology Conference Yokohama 733 737 1995
- McMillan M. Linden J. “Future Lubricant Requirements and Their Impact on Base Oils,” 1 st ICIS/LOR Pan American Base Oils & Lubricants Conference 2005
- High temperature oxidation stability test procedure for evaluating automobile gasoline engine oils JASO M333 1993
- Gatto V. Bezjak Y. “The Antioxidant Properties of Organomolybdenum Compounds in Engine Oils,” Tribology & Lubrication Technology 59 10 40 47 2003
- Gatto V. Grina M. “Effects of Base Oil Type, Oxidation Test Conditions and Phenolic Antioxidant Structure on the Detection and Magnitude of Hindered Phenol/Diphenylamine Synergism,” Lubrication Engineering 11 20 1999