Patent ID: 7704928
Filing Date: 2010-04-27
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition for manual transmissions, comprising a lubricating base oil with a kinematic viscosity at 100° C. of 4 to 6 mm 2 /s, on the basis of the total mass of the composition, (A) 0.14 to 0.20 percent by mass in terms of magnesium of magnesium sulfonate, (B) 0.14 to 0.18 percent by mass in terms of zinc of zinc dithiophosphate represented by formula (I) below, (C) 0.3 to 0.5 percent by mass in terms of sulfur of a sulfur-containing extreme pressure additive other than zinc dithiophosphate which comprises (C-4) dihydrocarbyl polysulfide compounds and at least one compound selected from the group consisting of (C-1) thiazole compounds, (C-2) thiadiazole compounds. (C-3) dithiocarbamate compounds, and (C-5) sulfurized ester compounds, and (D) 0.02 to 0.05 percent by mass in terms of phosphorus of an alkyl phosphite, and having a kinematic viscosity at 40° C. of 25 to 30 mm 2 /s: wherein R