Low-viscosity lubricating oil composition with improved durability and nvh performance

Abstract

A low-viscosity lubricating oil composition with improved durability and NVH (noise, vibration, and harshness) performance is provided. The durability and NVH performance of the low-viscosity lubricating oil can be improved by appropriately combining mineral oil and/or synthetic oil and a viscosity index improver.

1 . A lubricating oil composition comprising:
 a lube base oil comprising mineral oil and synthetic oil;   a viscosity index improver; and   an additive,   wherein the lubricating oil composition comprises, based on a total weight of the lubricating oil composition,   50 to 80 wt % of the mineral oil,   10 to 40 wt % of the synthetic oil,   1 to 10 wt % of the viscosity index improver, and   9 to 20 wt % of the additive,   wherein the lubricating oil composition has a kinematic viscosity at 100° C. in a range of 2.8 to 4.0 cSt.   
     
     
         2 - 4 . (canceled) 
     
     
         5 . The lubricating oil composition of  claim 1 , wherein the synthetic oil comprises polyalphaolefin (PAO)-based synthetic oil. 
     
     
         6 . The lubricating oil composition of  claim 1 , wherein the synthetic oil has a kinematic viscosity at 100° C. in a range of 2.0 to 3.0 cSt. 
     
     
         7 . (canceled) 
     
     
         8 . The lubricating oil composition of  claim 1 , wherein the mineral oil comprises highly-refined mineral oil having an aromatic component content of 0.1 wt % or less. 
     
     
         9 . The lubricating oil composition of  claim 1 , wherein the mineral oil has a kinematic viscosity at 100° C. in a range of 2.0 to 4.0 cSt. 
     
     
         10 . The lubricating oil composition of  claim 1 , wherein the mineral oil has a viscosity index (VI) equal to or greater than 100. 
     
     
         11 . The lubricating oil composition of  claim 1 , wherein the viscosity index improver comprises poly(alkyl methacrylate). 
     
     
         12 . The lubricating oil composition of  claim 1 , wherein a weight average molecular weight (Mw) of the viscosity index improver is in a range of 10,000 to 50,000 g/mol. 
     
     
         13 . The lubricating oil composition of  claim 1 , wherein the additive comprises at least one of a detergent, an antioxidant, an antiwear agent, a dispersant, a friction modifier, a corrosion inhibitor, or a combination thereof. 
     
     
         14 . The lubricating oil composition of  claim 13 , wherein the detergent comprises at least one of a sulfonate detergent, a phenate detergent, a salicylate detergent, or a combination thereof. 
     
     
         15 . The lubricating oil composition of  claim 13 , wherein the antioxidant comprises at least one of hindered phenols, aromatic amines, or a combination thereof. 
     
     
         16 . The lubricating oil composition of  claim 1 , wherein the lubricating oil composition further comprises at least one of a pour point depressant, an antifoaming agent, or a combination thereof.