Patent ID: 9725672
Date: 2017-08-08
CPC Classifications: C10M,C10N

Claim:
1. A method for lubricating a continuously variable transmission comprising contacting a lubricating oil composition with a continuously variable transmission; wherein said lubricating oil composition comprises components (A), (B), (C) and (D); wherein: the component (A) contains 45 to 65 mass % of a mineral oil, a poly-alpha-olefin, or a mixture of a mineral oil and a poly-alpha-olefin, wherein the sulfur content of each of said mineral oil and poly-alpha-olefin does not exceed 0.03% by mass and wherein each of the mineral oil and poly-alpha-olefin has a kinematic viscosity at 100 degrees C. in a range of 1.5 mm the component (B) contains 10 to 20 mass % of a mineral oil or a mixture of a mineral oil and a poly-alpha-olefin, wherein the sulfur content of each of said mineral oil and poly-alpha-olefin does not exceed 0.03% by mass, and wherein each of said mineral oil and poly-alpha-olefin has a kinematic viscosity at 100 degrees C. ranging from 5.5 mm the component (C) contains from 5 to 12 mass % of a poly-alpha-olefin having a kinematic viscosity at 100 degrees C. in a range of 30 mm the component (D) contains from 8 to 14 mass % of a polymethacrylate having a mass average molecular weight in a range of 10,000 to 40,000; wherein a total content of the components (C) and (D) in said composition is 19 mass % or more; wherein the mass % of the components (A), (B), (C) and (D) are based on the total mass of said lubricating oil composition; and wherein the lubricating oil composition has a kinematic viscosity at 100 degrees C. in a range of 5.5 mm