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The performance and mechanisms of organic polymeric friction modifiers in low viscosity engine oils
Technical Paper
2019-01-2204
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The requirement of OEMs to reduce CO2 emissions is leading to a reduction in viscosity of engine oils with 0W20 approved oils now common. 0W 16 approvals are growing in popularity and will be further supported in the US by the introduction of ILSAC GF-6B. Japanese OEMs are driving the development of 0W- 12 and 0W08 grades which will be supported by JASO GLV-1. These low viscosity engine oils can contain MoDTC with very high levels of 1000+ppm molybdenum to achieve the fuel economy improvement required to pass engine tests such as Sequence VIE. Molybdenum usage at this level contributes to sulphated ash increase. It can also have a negative impact on deposits.
This paper examines the performance and mechanism of two ashless polymeric friction modifiers in a 0W20 formulation. These polymeric friction modifiers have been shown to give fuel economy benefits in Sequence VIE engine tests. The aim of this work is to better understand the influence and interaction of these polymeric friction modifiers in the presence of ZDDP as well as other additives, in tribological testing. Specifically, how the friction and wear benefits observed in MTM testing correlate to the chemical composition of the tribofilm as characterised by X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy.
Further work detailing the combination of polymeric friction modifier and MoDTC was conducted on the MTM, including surface characterisation for potential synergistic properties in the reference oil.
Evidence of the polymeric friction modifier on the surface, and throughout the depth of the tribofilm, was observed, even in the presence of molybdenum containing additives. This work proves the good surface affinity and film forming properties of polymeric friction modifiers and highlights the differences in the tribofilm composition depending on the friction modifier(s) used.
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Citation
Moody, G., Eastwood, J., and Ueno, K., "The performance and mechanisms of organic polymeric friction modifiers in low viscosity engine oils," SAE Technical Paper 2019-01-2204, 2019, https://doi.org/10.4271/2019-01-2204.Data Sets - Support Documents
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References
- V. Macian , B. Tormos , S. Ruiz , and G. Miro , Low viscosity engine oils: Study of wear effects and oil key parameters in a heavy duty engine fleet test Trib. Int. 94 2016 240 248
- Y. Okuyama , D. Shimokoji , T. Sakurai , and M. Maruyama , Study of low viscosity engine oil on fuel economy and engine reliability SAE Int. 2011-01-1247
- P. Carden , C. Pisani , J. Andersson , I. Field , et al. The effect of low viscosity oil on the wear, friction and fuel consumption of a heavy duty truck engine SAE Int. 2013-01-0331
- Z. Zhang , E. Yamaguchi , M. Kasrai , and G. Bancroft , Tribofilms generated from ZDDP and DDP on steel surfaces Part 1 Tribol Letters 2005 19 3 211 229
- H. Spikes , The history and Mechanisms of ZDDP Trib. Letters 17 3 2004 469 489
- A. Morina , and A. Neville , Tribofilms: Aspects of formation, stability and removal J. Phys. D: Appl. Phys. 40 2007 5476 5487
- M. Ratoi , V.B. Niste , H. Alghawel , Y. Suen , and K. Nelson , The impact of organic friction modifiers on engine oil tribofilms RSC Adv. 2014 4 4278 4285
- K. Topolovec , T. Forbus , and H. Spikes , Performance of friction modifiers on ZDDP generated surfaces Tribol. Trans. 2007 50 3 328 335
- C. Grossiord , J. Martin , K. Vacher , T. Le Monge , and Y. Yamada , Tribochemical interactions between ZnDTP MoDTC and calcium borate Trib. Letters 8 4 2000 203 212
- D. Khaemba , A. Neville , and A. Morina , New insights on the decomposition mechanism of MoDTC; A Raman spectroscopic study RSC Adv. 2016 6 38637 38646
- A. Morina , A. Neville , M. Priest , and J. Green , ZDDP and MoDTC interactions and their effect on tribological performance - tribofilm characteristics and its evolution Trib. Letters 2006 24 3 243 256
- J. Graham , H. Spikes , and R. Jensen , The friction reducing properties of MoDTC additives Part II durability of friction reducing capability Trib. Trans. 44 4 2001 637 647