1. Phosphorus Volatility in GF4 Engine Tests Presentation for ASTM ESCIT May 4, 2006

2. Absolute P Levels

3. Absolute Ca Levels

4. Loss of Baseoil Volatiles

5. Phosphorus, Adjusted for Baseoil Loss

6. Bulk Oil Temperatures

7. Phosphorus Volatility Summary and Recommendations
Can be determined using conventional UOA
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

8. Another Important Point
There are substantial differences among ZDDP additives, both for P volatility and for antiwear performances
Recent OEM data compare a “Conventional” ZDDP versus a “Low Impact” ZDDP
Meaning of these terms are unclear
May be relevant to a single additive supplier