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Engine Test vs. PEI-165 Oil Stress Mechanism Analysis Relative to ZDP

Engine Test vs. PEI-165 Oil Stress Mechanism Analysis Relative to ZDP. ESCIT Meeting 24 April 2007. Oil Stress Relative to ZDP. R.C. Coy and R.B. Jones, “The Degradation of Zinc Dialkyldithiophosphate Additives in Rigs and Engines”, Institute of Mech. Eng. Conf Pub No. 1, (1982).

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Engine Test vs. PEI-165 Oil Stress Mechanism Analysis Relative to ZDP

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  1. Engine Test vs. PEI-165 Oil Stress Mechanism Analysis Relative to ZDP ESCIT Meeting 24 April 2007

  2. Oil Stress Relative to ZDP R.C. Coy and R.B. Jones, “The Degradation of Zinc Dialkyldithiophosphate Additives in Rigs and Engines”, Institute of Mech. Eng. Conf Pub No. 1, (1982) Oxidation is the main pathway for ZDDP degradation in fully formulated engine oils. Thermal degradation is not the major pathway S. Korcek, L.R. Mahoney, M.D. Johnson, and W.O. Siegl, “Mechanisms of Antioxidant Decay in Gasoline Engines: Investigations of Zinc Dialkyldithiophosphate Additives”, SAE 810014, (1981). Deletion of ZDP accompanied by disulfide formation was observed R.C. Coy and R.B. Jones, “The Thermal Degradation and EP Performance of Zinc Dialkyldithiophosphates Additives in White Oil”, ASLE/ASME Lubrication Conference, 1979. Thermal Degradation does not produce disulfides

  3. Oil Stress Relative to ZDP Phosphates PEI 165 Thermal Pathways ZDP Oxidation/ NOx Pathways Field & Engine (IIIG) Active Species Phosphates Active Pathway Products are volatile. Phosphates are not volatile.

  4. Oil Stress Relative to ZDP P31 NMR analysis

  5. Oil Stress Relative to ZDP P31 NMR analysis

  6. Oil Stress Relative to ZDP Oxidation Analysis (IR)

  7. Mechanism Comparison Phosphorus Retention (PR) Equation % PR = (Ca@t=0/Ca@t=20) x (Phos@t=20/Phos@t=0) x 100

  8. Mechanism Comparison % Ca in Used Oil Is the Mechanism of PEI 165 the same as in the Seq IIIG or in the Field?

  9. Individual Test Results and Means for Reference Oils in the Seq IIIG"PR20“ and IIIG@ 20 hours

  10. Individual Test Results for Reference Oils in the PEI-165

  11. Conclusions • The Sequence IIIG is designed and accepted to stress the oils similar to severe field service • The PEI-165 and Sequence IIIG stress oils differently • PEI-165 does not rank the oils the same as the Sequence IIIG@ 20 hours and the IIIG"PR20“ • Oil stress on Ford Field Trials to be reported at the next ESCIT meeting

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