Inventors:
Sanjay Srinivasan - Midlothian VA
David Warren Smith - Richmond VA
John P. Sunne - Midlothian VA
Assignee:
Ethyl Corporation - Richmond VA
International Classification:
C10M13700
C10M15300
Abstract:
Automatic transmission fluids are described which contain a dispersant having a nitrogen to phosphorus mass ratio between about 3:1 and about 10:1, and at least one friction modifier. The use of dispersants having a nitrogen to phosphorus mass ratio between about 3:1 and about 10:1 provides automatic transmission fluids which exhibit good anti-shudder properties as well as a higher mid-point torque, a higher static torque in shifting clutch applications and better frictional durability as compared to similar automatic transmission fluids which contain dispersants having a nitrogen to phosphorus mass ratio of less than 3:1.