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1. (WO2018219827) LUBRICATING OIL COMPOSITION FOR AUTOMOBILE TRANSMISSION

Pub. No.:    WO/2018/219827    International Application No.:    PCT/EP2018/063828
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat May 26 01:59:59 CEST 2018
IPC: C10M 111/04
Applicants: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
SHELL OIL COMPANY
Inventors: KAMEI, Genki
MARUYAMA, Ryuji
SAITOU, Shinji
HARADA, Shouhei
Title: LUBRICATING OIL COMPOSITION FOR AUTOMOBILE TRANSMISSION
Abstract:
This invention provides a lubricating oil composition for automobile transmission that includes: as low-viscosity base oils: (i) between 45 and 95 mass% of a Fischer-Tropsch synthetic low-viscosity base oil with a 100°C kinematic viscosity of between 1 mm²/s and 2 mm²/s, and between 0 and 25 mass% of other than a Fischer-Tropsch synthetic low-viscosity base oil with a 100°C kinematic viscosity of between 1 mm²/s and 2 mm²/s, and (ii) between 0 and 35 mass% of a base oil wherein the 100°C kinematic viscosity is greater that 2 mm²/s and no greater than 5 mm²/s; and (iii) between 5 and 55 mass% of an olefin polymer or copolymer, as a high-viscosity base oil, wherein the 100°C kinematic viscosity is between 100 and 800 mm²/s. A lubricating oil composition for an automatic transmission wherein the 100°C kinematic viscosity of this composition is between 3.8 and 5.5 mm²/s, the viscosity index is no less than 190, the flashpoint is no less than 140°C, and the reduction ratio of the 100°C kinematic viscosity after shear stability testing, at 60°C for 20 hours, is maintained at no greater than 3%.