Patent ID: 6642189
Filing Date: 2003-11-04
Classification: C10M,C10N

Abstract:
An engine oil composition consisting essentially of (A) a lubricating base oil having a kinematic viscosity at 100Â° C. of 3 to 6 mm2/s, a viscosity index of 120 or more, and a total aromatic content of 5 percent by mass or less and (B) a polymethacrylate-based viscosity index improver having a weight-average molecular weight of 180,000 or more, (A) and (B) being blended in such amounts that the composition has a kinematic viscosity at 100Â° C. of 4.0 to 9.3 mm2/s and a high temperature, high shear viscosity at 150Â° C. of 2.4 to 2.7 mPaÂ·s.