Low viscosity lubricating oil composition

Abstract

A lubricating oil composition having a high temperature high shear (HTHS) viscosity at 150° C. in a range of about 1.3 to about 2.3 cP is disclosed. The composition comprises (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100° C. in a range of 1.5 to 6.0 mm 2 /s; and (b) a molybdenum-succinimide complex providing 200 to 1500 ppm by weight of molybdenum to the lubricating oil composition.

1 . A lubricating oil composition having a HTHS viscosity at 150° C. in a range of about 1.3 to about 2.3 cP, comprising:
 (a) a major amount of an oil of lubricating viscosity having a kinematic viscosity at 100° C. in a range of 1.5 to 6.0 mm 2 /s; and 
 (b) a molybdenum-succinimide complex providing 200 to 1500 ppm by weight of molybdenum to the lubricating oil composition, wherein the molybdenum-succinimide complex is the only source of molybdenum in the lubricating oil composition; and 
 further wherein the lubricating oil composition is a 0W-8, 0W-12 or 0W-16 SAE viscosity grade. 
 
     
     
         2 . (canceled) 
     
     
         3 . The lubricating oil composition of  claim 1 , wherein the oil of lubricating viscosity is a base oil selected from one or more of API Group II, Group III, Group IV, and Group V. 
     
     
         4 . The lubricating oil composition of  claim 1 , wherein the succinimide is a C 24  to C 350  alkyl or alkenyl succinimide. 
     
     
         5 . The lubricating oil composition of  claim 1 , wherein the succinimide is a polyisobutenyl succinimide and the polyisobutenyl succinimide is a reaction product of a C 70  to C 128  polyisobutenyl succinic anhydride and a polyalkylene polyamine selected from triethylenetetramine, tetraethylenepentamine, and combinations thereof. 
     
     
         6 . The lubricating oil composition of  claim 1 , wherein the molybdenum-succinimide complex is a sulfurized molybdenum-succinimide complex. 
     
     
         7 . The lubricating oil composition of  claim 1 , wherein the molybdenum-succinimide complex is an unsulfurized molybdenum-succinimide complex. 
     
     
         8 . The lubricating oil composition of  claim 1 , which is for an internal combustion engine selected from a direct injection spark ignition engine and a port fuel injection spark ignition engine coupled to an electric motor/battery system in a hybrid vehicle. 
     
     
         9 . A method of reducing friction in an engine lubricated with a lubricant by using as the lubricant the lubricating oil composition of  claim 1 . 
     
     
         10 . A method of reducing wear in an engine lubricated with a lubricant by using as the lubricant the lubricating oil composition of  claim 1 . 
     
     
         11 . A method of improving fuel economy in an engine lubricated with a lubricant by using as the lubricant the lubricating oil composition of  claim 1 . 
     
     
         12 . The method of any one of  claims 9 ,  10 , and  11 , in which the engine is a direct injection spark ignition engine. 
     
     
         13 . The method of any one of  claims 9 ,  10 , and  11 , in which engine is a port fuel injection spark ignition engine coupled to an electric motor/battery system in a hybrid vehicle.