Determination of Phosphorus Volatility from Lubricant Sequence Tests
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Determination of Phosphorus Volatility from Lubricant Sequence Tests Presentation for ASTM ESCIT August 8, 2006. Phosphorus Volatility Summary and Recommendations (5-4-06). Can be determined using conventional UOA [ neglecting P consumed in anti-wear films and deposits ]

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Phosphorus Volatility Summary and Recommendations (5-4-06)

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Phosphorus volatility summary and recommendations 5 4 06

Determination of Phosphorus Volatility from Lubricant Sequence TestsPresentation for ASTM ESCITAugust 8, 2006


Phosphorus volatility summary and recommendations 5 4 06

Phosphorus VolatilitySummary and Recommendations (5-4-06)

  • Can be determined using conventional UOA

    [ neglecting P consumed in anti-wear films and deposits ]

  • Sequence VIB appears to show “reasonable” scale

  • Possibilities for “multitasking” of a GF5 engine test to also yield measures of P volatility should be investigated

    • Analogous to IIIGA and T10A

    • Not as an extra P/F criterion

    • Goal is efficient utilization of data


Bulk oil temperatures

Bulk Oil Temperatures


Multitasking of a sequence test issues

“Multitasking” of a sequence testIssues

  • Discrimination

    • Ability to distinguish finished oils with “good” versus “poor” performance

    • Industry reference oils needed

  • Precision

  • Calibration and Limits

    • Relative to 120,000 miles EPA durability schedule?

    • For which engine?

  • Rules for BOI and VGRA

    • Handle as “Technology Approval” rather than qualification of all products and grades


Zddp structure performance

ZDDP Structure-Performance

  • Factors which reduce P volatility tend to compromise anti-wear performance

  • P retention is a finished oil issue. Any new specification could lead to new formulation approaches

    • Chemistry and dosage of the ZDDP system

    • Detergent system

    • Dispersant system

    • Friction modifier system

    • Antioxidant system


Next steps

Next Steps

  • Sequence test data are needed for reference oils

    • IIIG/IIIH

    • VIB/VID


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