Abstract
The Thermo-oxidation engine Oil Simulation Test (TEOST 33C), one request of the new ILSAC GF-5 specification for passenger car, has been developed as a simulation test to evaluate the “coking” of engine oil in turbocharger. Generally, molybdenum dithiocarbamate (MoDTC) is added into engine oil as an effective friction modifier to improve fuel economy. Zinc dialkyldithiophosphate (ZnDDP) has also been used as a multifunction additive in engine oils for more than 50 years. However, the results of this study showed that the coexistence of MoDTC and ZnDDP in engine oil could cause deposits accretion of the oil in the TEOST 33C. Pressurized Differential Scanning Calorimetry (PDSC) revealed that excess MoDTC led to the oxidative degradation of engine oil and there was no obvious relationship between oxidation stability and “coking” of engine oil. In addition, the elemental analysis of deposits demonstrated that deposits accretion was not caused by the increase ash of MoDTC. In summary, the MoDTC coexisted with ZnDDP might be acted as a “coking” catalyst under high temperature.
F2012-A03-009
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Keller J, Lowther H, Rogers T (1981) Lubricant performance in passenger car turbochargers. SAE Technical Paper 810016
Florkowski D, Selby T (1993) The development of a thermo-oxidation engine oil simulation test (TEOST). SAE Technical Paper 932837
ILSAC GF-5 (2009) Standard for passenger car engine oils
Tseregounis S, McMillan M, Olree R (1998) Engine oil effects on fuel economy in GM vehicles—separation of viscosity and friction modifier effects. SAE Technical Paper 982502
Korcek S et al (1998) Retention of fuel efficiency of engine oils. In: Proceedings of the 11th international colloquium, Esslingen
Arai K et al (1995) Lubricant technology to enhance the durability of low friction performance of gasoline engine oils. SAE Paper 952533
Yoshida S, Naitoh Y (2008) Analysis of deposit formation mechanism on TEOST 33C by engine oil containing MoDTC. SAE Paper 2008-01-2480
Acknowledgements
The authors would gratefully acknowledge the previous work of Satoru Yoshida and Yasushi Naitoh in research of TEOST 33C. Assistance from Wang aixiang and Xu jinbao is also acknowledged.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Wang, L., Wang, L., Li, G. (2013). Analysis of Engine Oil Containing MoDTC on the Thermo-Oxidation Engine Oil Simulation Test (TEOST 33C). In: Proceedings of the FISITA 2012 World Automotive Congress. Lecture Notes in Electrical Engineering, vol 189. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33841-0_35
Download citation
DOI: https://doi.org/10.1007/978-3-642-33841-0_35
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-33840-3
Online ISBN: 978-3-642-33841-0
eBook Packages: EngineeringEngineering (R0)