| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-viscosity engine oil composition having a lower viscosity than that of the lowest-viscosity grade engine oil composition specified by SAE (society of automotive engineers) viscosity classification, ensuring abrasion resistance at high temperatures and having excellent abrasion resistance without increasing the amount of an added abrasion-resistant agent. SOLUTION: The engine oil composition is obtained by compounding zinc dithiophosphate in an amount of 0.02-0.12 mass% expressed in terms of the amount of phosphorus and an effective amount of at least one kind of additive for the engine oil in a base oil composed of mineral oils and/or synthetic oils. The engine oil composition is characterized by satisfying (1) <2.6 mPa s high-temperature high shear viscosity under conditions of 150°C and high shear of 1×10<SP>6</SP>s<SP>-1</SP>and (2) formula. COPYRIGHT: (C)2006,JPO&NCIPI |
