Patent ID: 7399736

Claim:
An engine oil composition of low viscosity and high abrasion resistance comprising a base oil comprised of a mineral oil, a synthetic oil or mixture thereof and 0.02 to 0.12 mass % of zinc dithiophosphate measured as the amount of phosphorus based on the total weight of the engine oil composition, wherein the engine oil composition: (1) has a high-temperature high-shear (HTHS) viscosity at 150° C. and at a shear rate of 1×10 6 s −1 of less than 2.6 mPa·s; and (2) satisfies the following formula: kinematic ⁢ ⁢ viscosity ⁢ ⁢ at ⁢ ⁢ 100 ∘ ⁢ ⁢ C . ⁢ ( mm 2 ⁢ / ⁢ s ) high ⁢ - ⁢ temperature ⁢ ⁢ high ⁢ - ⁢ shear ⁢ ⁢ viscosity ⁢ ⁢ at ⁢ ⁢ 100 ∘ ⁢ C . and ⁢ ⁢ at ⁢ ⁢ a ⁢ ⁢ shear ⁢ ⁢ rate ⁢ ⁢ of ⁢ ⁢ 1 × 10 6 ⁢ ⁢ s - 1 ⁢ ⁢ ( mPa · s ) ⁢ ≤ 1.3 .