An engine oil composition that has lower viscosity then the lowest viscosity grade specified by the current standard (SAE (Society of Automotive Engineers) viscosity classification) and achieves excellent abrasion resistance under conditions of high temperature and high shear rate without an increase in the amount of anti-abrasion agent, said engine oil composition characterized by the following facts: the engine oil composition contains 0.02-0.12 mass% of zinc dithiophosphate, measured in the phosphorous amount based on the total weight of the composition, in a base oil compromised of a mineral oil and/or a synthetic oil;
(1) the high-temperature high-shear viscosity at 150°C and at a shear rate of 1 x 106 s-1 is less than 2.6 mPa•s;
(2) the engine oil composition satisfies the following equation:kinematic viscosity at 100°C (mm2/s)high - temperature high - shear viscosity at 100°C and at a shear rate of 1 x 106 s-1 (mPa • s) ⊥ ≤ 1.3
一种发动机油组合物,其粘度低于现行标准(SAE(美国汽车工程师学会)粘度分类)规定的最低粘度等级,并且在不增加抗磨剂用量的情况下,在高温和高剪切率条件下具有优异的耐磨性,所述发动机油组合物的特征如下:在由矿物油和/或合成油组成的基础油中,发动机油组合物含有 0.02-0.12 质量%的
二硫代磷酸锌(以组合物总重量中的
磷量计算);
(1) 在 150°C,剪切速率为 1 x 106 s-1 时,高温高剪切粘度小于 2.6 mPa-s;
(2) 发动机机油组合物满足下式:100°C 时的运动粘度(mm2/s)100°C 时剪切速率为 1 x 106 s-1 时的高温高剪切粘度(mPa-s) ⊥≤ 1.3