Lubricating oil composition and use thereof

Abstract

A lubricating oil composition having a sulfur content of from 0.3 to 0.5 wt. %, a phosphorus content of from 0.10 to 0.13 wt. % and a sulfated ash content of from 0.1 to 1.1 wt. %, based on the total weight of the lubricating oil composition is provided. The lubricating oil composition contains at least one Group II mineral base oil; at least one alkali and/or alkaline earth metal alkyl salicylate; an ashless dispersant; at least one zinc didithiophosphate; and at least one aminic ashless antioxidant and at least one phenolic ashless antioxidant.

1 . A lubricating oil composition having a sulfur content of from 0.3 to 0.5 wt %, a phosphorus content of from 0.10 to 0.13 wt % and a sulfated ash content of from 0.1 to 1.1 wt %, based on the total weight of the lubricating oil composition, comprising: 
 a) at least one Group II mineral base oil;    b) at least one alkali and/or alkaline earth metal alkyl salicylate;    c) an ashless dispersant;    d) a zinc dithiophosphate; and    e) at least one aminic ashless antioxidant and at least one phenolic ashless antioxidant.    
   
   
       2 . The lubricating oil composition of  claim 1  wherein the at least one aminic ashless antioxidant and at least one phenolic ashless antioxidant are present in a ratio in the range of about 1:1 to about 1:4.  
   
   
       3 . The lubricating oil composition of  claim 1  wherein the alkali and/or alkaline earth metal alkyl salicylate is calcium alkyl salicylate.  
   
   
       4 . The lubricating oil composition of  claim 2  wherein component e) is present in an amount in the range of about 0.1 to about 5 weight percent based on the total weight of the lubricating oil composition.  
   
   
       5 . The lubricating oil composition of  claim 1  further comprises at least one of viscosity modifier and pour point depressant.  
   
   
       6 . The lubricating oil composition of  claim 1  wherein component d) is a zinc dialkyldithiophosphate.  
   
   
       7 . The lubricating oil composition of  claim 1  wherein a major amount of the Group II mineral base oil is present.  
   
   
       8 . The lubricating oil composition of  claim 1  wherein component d) is present in an amount in the range of from 0.11 to 0.15wt %, based on Zinc content, based on the lubricating oil composition.  
   
   
       9 . The lubricating oil composition of  claim 1  wherein component b) is present in an amount in the range of 0.05 to 5.0 wt %.  
   
   
       10 . The lubricating oil composition of  claim 1  wherein the sulfur content is from 0.3 wt % to 0.4 wt %.  
   
   
       11 . The lubricating oil composition of  claim 1  wherein the sulfur content is from 0.35 wt % to 0.5 wt %.  
   
   
       12 . The lubricating oil composition of  claim 6  wherein the viscosity index improver is a styrene-isoprene block copolymer.  
   
   
       13 . The lubricating oil composition of  claim 1  having a kinematic viscosity at 100° C. in the range of from 5 to 20 mm2/s.  
   
   
       14 . The lubricating oil composition of  claim 7  wherein the Group II mineral base oil has a viscosity index of more than 80.  
   
   
       15 . A lubricating oil composition having a having a kinematic viscosity at 100° C. in the range of from 2 to 20 mm 2 /s, sulfur content of from 0.3 to 0.4 wt %, a phosphorus content of from 0.11 to 0.13 wt % and a sulfated ash content of from 0.9 to 1.1 wt %, based on the total weight of the lubricating oil composition, comprising: 
 a) a major amount of at least one Group II mineral base oil;    b) 2.0 to 5.0 wt % of at least one alkali and/or alkaline earth metal alkyl salicylate;    c) 5 to 15 wt % of at least one ashless dispersant;    d) 0.11 to 0.15 wt %, based on zinc content, of at least one zinc dithiophosphate; and    e) about 0.1 to about 5 weight percent of at least one aminic ashless antioxidant and at least one phenolic ashless antioxidant in a ratio of aminic ashless antioxidant to phenolic ashless antioxidant in the range of about 1:1 to about 1:4.    
   
   
       16 . A method of lubricating an internal combustion engine comprising introducing into the internal combustion engine a lubricating oil composition of  claim 1 .  
   
   
       17 . A method of-lubricating an internal combustion engine comprising introducing into the internal combustion engine a lubricating oil composition of  claim 15.