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Engine Oil Additive Effects on the Deterioration of a Stoichiometric Emissions Control (C-4) System
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Abstract
Phosphorus, originating from the commonly used engine oil additive zinc dialkyldithiophosphate (ZDP), contributed to the deterioration in the performance of a stoichiometric emissions control system. Data obtained from a series of 200-hour engine-dynamometer tests suggest two separate means for phosphorus-induced system deterioration: reduced CO, NOx, and HC conversion efficiencies due to catalyst poisoning; increased oxygen sensor rich-to-lean response time and altered oxygen sensor output voltage due to sensor contamination. The presence of an alkaline metal detergent in the ZDP-containing engine oil resulted in less deterioration of converter HC efficiency, but had no effect on the other system performance parameters.
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Citation
Caracciolo, F. and Spearot, J., "Engine Oil Additive Effects on the Deterioration of a Stoichiometric Emissions Control (C-4) System," SAE Technical Paper 790941, 1979, https://doi.org/10.4271/790941.Also In
References
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- June 29 1977