| abstract |
Lubricating for an automatic transmission having a synchronization mechanism that satisfies the seizure resistance and abrasion resistance required for transmission oil, the judder prevention property of a wet clutch, and the synchronization performance of the synchronization mechanism while improving fuel economy An oil composition is provided. SOLUTION: (A) As a lubricating base oil, a mineral base oil and / or a synthetic base oil and (B) a thiadiazole compound in an amount such that the total sulfur content in the composition is 0.20% by mass or more. And (C) 0.1 mass% or more of a phosphorus-containing friction modifier having a linear alkyl or alkenyl group having 12 or more carbon atoms, and (D) a phosphorus-containing additive other than the component (C) The amount of total phosphorus in the product is 0.04% by mass or more and (E) a poly (meth) acrylate having a weight average molecular weight of 50,000 or less, and the composition has a kinematic viscosity at 40 ° C. of 25 mm 2. / S or less and a viscosity index of 170 or more, a lubricating oil composition for an automatic transmission having a synchro mechanism. [Selection figure] None |