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How Modern Engine Oils can impact on Emission Reduction
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 19, 2003 by SAE International in United States
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Automotive engine oils have, for many years, relied on ZnDTP to provide protection against wear. ZnDTP functions by creating a sacrificial chemical layer between contacting metal surfaces which are in relative motion with each other.
In order to meet the requirements of ever more stringent emissions control legislation modern automotive vehicles are now fitted with complex exhaust after treatment devices and engine control systems.
The phosphorous contribution from ZnDTP is, typically, 1000 - 1400 ppm. It has been suggested that phosphorous can have detrimental effect on the performance of the after treatment exhaust catalyst and emission control systems (1,3).
This study demonstrates the effects of reducing phosphorous in automotive engine oils on both exhaust after treatment devices and on emission control system sensors by comparing the performance of two lubricant formulations, differing only in the antiwear chemistry, in fired engine bench tests. This comparison demonstrates that significant improvements in emissions control can be achieved by reducing the level of phosphorous in engine oil formulations without compromising wear protection.
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CitationGotta, L., Natoli, G., Salino, P., Barr, D. et al., "How Modern Engine Oils can impact on Emission Reduction," SAE Technical Paper 2003-01-1989, 2003, https://doi.org/10.4271/2003-01-1989.
- Korcek S. et al Ford Motor Co. “Automotive Lubricants for the Next Millenium”
- Natoli G. Pometto G. Salino P. Guerzoni M. FL Selenia “Three way Catalyst Deactivation by Lubricant during fast ageing engine test” Brussels May 1995
- Roos J. W et al. Ethyl Co. “A System Approach to Improved Exhaust Catalyst Durability: The Role of the MMT Fuel Additive2 SAE 2000-01-1880