Abstract: A method for maintaining a total base number (TBN) above about 3 mg KOH/g for a lubricant for a diesel engine for greater than about 184 days. The method includes supplying as the lubricant, a lubricant composition comprising a sulfonate detergent having a TBN ranging from about 20 to about 100 and a phenate detergent having a TBN ranging from about 200 to about 350 and an antioxidant selected from the group consisting essentially of hindered phenolic derivatives of C3 to C6 acids and C7 to C9 esters of hindered phenolic derivatives of C3 to C6 acids. The phenate detergent is present in an amount that is greater than 15 percent by weight of the total weight of detergents in the lubricant composition and the lubricant composition is substantially devoid of zinc dialkydithiophosphate compounds and has a sulfated ash content of less than 1.0 wt. %.

Abstract: 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 or recycle engines.

Abstract: A method for maintaining a total base number (TBN) above about 3 mg KOH/g for a lubricant for a diesel engine for greater than about 184 days. The method includes supplying as the lubricant, a lubricant composition comprising a sulfonate detergent having a TBN ranging from about 20 to about 100 and a phenate detergent having a TBN ranging from about 200 to about 350 and an antioxidant selected from the group consisting essentially of hindered phenolic derivatives of C3 to C6 acids and C7 to C9 esters of hindered phenolic derivatives of C3 to C6 acids. The phenate detergent is present in an amount that is greater than 15 percent by weight of the total weight of detergents in the lubricant composition and the lubricant composition is substantially devoid of zinc dialkydithiophosphate compounds and has a sulfated ash content of less than 1.0 wt. %.

Abstract: An additive concentrate, lubricant composition, and method of operating a diesel engine on the lubricant composition wherein the lubricant composition exhibits extended service life. The concentrate and lubricant composition include a sulfonate detergent and a phenate detergent, wherein the phenate detergent is present in an amount that is greater than 15 percent by weight of the total weight of detergents in the lubricant composition, and an antioxidant selected from hindered phenolic derivatives of C3 to C6 acids and C7 to C9 esters of hindered phenolic derivatives of C3 to C6 acids. The lubricant composition is substantially devoid of zinc dialkyldithiophosphate compounds.

Abstract: This invention relates to detergents, lubricating oil additives and compositions, and methods of preparing detergents, lubricating oil additives and compositions. More specifically, this invention relates to novel phenolic dimers.

Abstract: There is disclosed an additive composition comprising (a) a highly reactive polyisobutenyl succinimide dispersant, (b) a polyisobutenyl succinimide dispersant, and (c) a grafted olefin copolymer viscosity index improver.

Abstract: A diesel engine operating on a fuel containing from about 5 to about 100 wt. % bio-diesel components and being lubricated with a lubricating oil composition including a major amount of oil of lubricating viscosity, and a minor amount of at least one highly grafted, multi-functional olefin copolymer. The olefin copolymer is made by reacting an acylating agent with an olefin copolymer having a number average molecular weight greater than about 1,000 in the present of a free radical initiator to provide an acylated olefin copolymer having a degree of grafting (DOG) of the acylating agent on the olefin copolymer of at least 0.5 wt. %, and reacting the acylated olefin copolymer with an amine to provide the highly grafted, multi-functional olefin copolymer. As used, the highly grafted, multi-functional olefin copolymer is effective to reduce a viscosity increase in the lubricating oil composition for the engine.

Abstract: 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 or recycle engines.

Abstract: A novel highly grafted, multi-functional olefin copolymer is provided comprising an additive reaction product of a method comprising reacting acylating agent with an olefin copolymer having a number average molecular weight greater than about 1,000 in the presence of a free radical initiator and essentially free of hydrocarbon solvent in an extruder to provide an olefin copolymer intermediate comprising an acylated olefin copolymer having a degree of grafting (DOG) of at least 0.5 wt. %, which copolymer intermediate's molecular weight is reduced, vacuum stripped of unreacted components, pelletized, dissolved in a neutral oil (preferably with inert gas sparging), and further reacted with a polyamine to provide a grafted multi-functional olefin copolymer viscosity modifier, and lubricating oil concentrates and compositions containing the same and uses thereof.