Patent ID: 11939551
Assignee: AFTON CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 14:
15. A method for lubricating a driveline component including an electric motor, the method comprising:
lubricating the driveline component with an electric driveline fluid;
the electric driveline fluid includes (i) one or more base oils of lubricating viscosity; (ii) a succinimide dispersant derived from a polyisobutylene having a number average molecular weight of about 2,000 or greater, wherein the succinimide dispersant has up to about 1 weight percent nitrogen and is post treated with a phosphorus containing compound and a boron containing compound, and wherein the succinimide dispersant delivers about 150 to about 270 ppm of dispersant phosphorus (P) to the electric driveline fluid; (iii) a sulfur-providing additive including a thiadiazole or derivative thereof providing at least about 1000 ppm of thiadiazole sulfur (S) to the electric driveline fluid, wherein the combined dispersant phosphorus and thiadiazole sulfur (P+S) is at least about 1300 ppm and wherein a weight ratio of the dispersant phosphorus to the thiadiazole sulfur (P/S) is at least about 0.1; (iv) a detergent system providing one or more calcium-containing detergents, wherein the one or more calcium-containing detergents provide no more than about 200 ppm of calcium; and (v) no more than about 0.4 weight percent of a friction modifier; and
wherein the electric driveline fluid has a kV100 viscosity of about 3.2 cSt or more, about 150 to about 270 ppm of total phosphorus, and an electrical conductivity of about 130 nS/M or less as measured by a modified conductivity test pursuant to ASTM D2624-15 using the electric driveline fluid and measured at 20 Hz and at 170° C.