Gary J Russo

US Patent:

20160108337, Apr 21, 2016

Filed:

May 13, 2014

Appl. No.:

14/890439

Inventors:

- Wickliffe OH, US
Kevin J. Streck - Seven Hills OH, US
Gary A. Russo - Willoughby OH, US
Elizabeth A. Schiferl - Chagrin Falls OH, US

International Classification:

C10M 169/04
C10M 137/02
C10M 139/00
C10M 135/10
C10M 145/14
C10M 125/24

Abstract:

The present invention relates to a lubricating composition comprising: (a) an oil of lubricating viscosity having a kinematic viscosity at 100 C. of 2.8 to 3.6 cSt (mm2/s) and a viscosity index of 104 to 130; (b) 1.2 to 5.0 wt % of at least one borated dispersant, wherein at least one borated dispersant is further functionalised with a sulphur or phosphorus moiety; (c) a calcium-containing detergent present in an amount to deliver at least 110 ppm to 700 ppm of calcium; (d) at least two phosphorus-containing compounds present in an amount to deliver 360 to 950 ppm of phosphorus; and (e) 0.1 wt % to 5 wt % of a linear polymer viscosity modifier having dispersant functionality. The invention further provides a method of lubricating a transmission with the lubricating composition disclosed wherein.