Lubricating oil compositions for inhibiting coolant-induced oil filter plugging

摘要

Lubricating oil compositions are provided that inhibit coolant -induced oil filter plugging in heavy-duty diesel engines, and particularly CJ-4 and CI-4 PLUS compliant lubricating oil compositions that inhibit coolant-induced oil filter plugging in exhaust gas recirculation (EGR) or recycle engines. The compositions contain an amine-functionalized olefin copolymer dispersant viscosity index improver made by reacting an acylated olefin copolymer and a polyamine compound. The compositions inhibit coolant-induced filter plugging, as measured by the Cummins ISM EGR test or the ISO 13357-2 test.