Lubricant composition

Abstract

A lubricant composition containing a mixture of at least two Fischer-Tropsch derived base oils and one or more additives wherein one Fischer-Tropsch derived base oil (low viscosity component) has a kinematic viscosity at 100° C. of less than 7 cSt and the second Fischer-Tropsch derived base oil (high viscosity component) has a kinematic viscosity at 100° C. of more than 18 cSt.

1 . A lubricant composition comprising: 
 a low viscosity Fischer Tropsch derived base oil component having a kinematic viscosity at 100° C. of less than 7 cSt;    a high viscosity Fischer Tropsch derived base oil component, having a kinematic viscosity at 100° C. of more than 18 cSt; and,    one or more additives.    
     
     
         2 . The lubricant of  claim 1 , comprising 0% of a viscosity modifier additive is zero.  
     
     
         3 . The lubricant of  claim 1 , in which the lubricant is an SAE “xW-y” viscosity lubricant formulation, wherein y-x is greater than or equal to 25.  
     
     
         4 . The lubricant of  claim 1 , wherein the low viscosity component has a pour point of less than −18° C.  
     
     
         5 . The lubricant of  claim 4 , wherein the pour point of the low viscosity component is less than −30° C.  
     
     
         6 . The lubricant of  claim 1 , wherein the low viscosity component has a kinematic viscosity at 100° C. of between 3.5 and 6 cSt, a viscosity index greater than 120 and a Noack volatility of less than 14 wt %.  
     
     
         7 . The lubricant of  claim 1 , wherein the high viscosity component has a kinematic viscosity at 100° C. of between 20 cSt and 40 cSt.  
     
     
         8 . The lubricant of  claim 7 , wherein the pour point of the high viscosity component is between −15° C. and +20° C.  
     
     
         9 . The lubricant of  claim 1 , wherein the viscosity index of the high viscosity component is between 150 and 190.  
     
     
         10 . The lubricant of  claim 1 , wherein the content of all lubricant comprises between 65 wt % and 95 wt % Fischer-Topsch derived base oils.  
     
     
         11 . The lubricant of  claim 10  comprising less than 10 wt % non-Fischer-Tropsch derived base oil  
     
     
         12 . The lubricant of  claim 11 , comprising 0 wt % non-Fischer-Tropsch derived base oil.  
     
     
         13 . (canceled)  
     
     
         14 . (canceled)  
     
     
         15 . (canceled)  
     
     
         16 . (canceled)  
     
     
         17 . A method comprising: 
 lubricating a gasoline direct injection engine with a lubricant comprising:    a low viscosity Fischer Tropsch derived base oil component having a kinematic viscosity at 100° C. of less than 7 cSt;    a high viscosity Fischer Tropsch derived base oil component having a kinematic viscosity at 100° C. of more than 18 cSt; and, one or more additives.    
     
     
         18 . The method of  claim 17 , in which the lubricant comprises 0% of a viscosity modifier additive.  
     
     
         19 . The method of  claim 17 , in which the lubricant is an SAE xW-y viscosity lubricant formulation, wherein y-x is greater than or equal to 25.  
     
     
         20 . The method of  claim 17 , in which the low viscosity component of the lubricant has a pour point of less than −180° C.  
     
     
         21 . The method of  claim 17 , in which the pour point of the low viscosity component of the lubricant is less than −30° C.  
     
     
         22 . The method of  claim 17 , in which the low viscosity component of the lubricant has a kinematic viscosity at 100° C. between 3.5 cSt and 6 cSt, a viscosity index greater than 120 and a Noach volatility of less than 14 wt %.  
     
     
         23 . The method of  claim 17 , in which the high viscosity component of the lubricant has a kinematic viscosity at 100° C. of between 20 cSt and 40 cSt  
     
     
         24 . The method of  claim 17 , in which the high viscosity component of the lubricant is between −15° C. and 20° C.  
     
     
         25 . The method of  claim 17 , in which the high viscosity component of the lubricant has a viscosity index between 150 and 190.  
     
     
         26 . The method of  claim 17 , in which the lubricant comprises between 65 wt % and 95 wt % Fischer-Tropsch derived base oils.  
     
     
         27 . The method of  claim 17 , in which the lubricant comprises less than 10 wt % non-Fischer-Tropsch derived base oil.  
     
     
         28 . The method of  claim 17 , in which the lubricant comprises 0 wt % non-Fischer-Tropsch derived base oil.