Lubricating composition with enhanced filterability

Abstract

A lubricating oil composition that includes a highly paraffinic base oil, a controlled release friction modifier (CRFM) and an effective amount of detergent. The CRFM includes an ionic tetrahedral borate compound comprising a cation and a tetrahedral borate anion which includes a boron atom, the boron atom having two bidentate di-oxo ligands of C 18 tartrimide. The CRFM is a high stabilizer CRFM. The detergent includes a mixed magnesium and calcium detergent system having a calcium to magnesium ratio of less than 2:1.

What is claimed is: 
     
         1 . A lubricating oil composition, comprising:
 a base oil comprising a highly paraffinic base oil;   a controlled release friction modifier (CRFM), including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C18-tartrimide, 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500, and 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; and 
   an effective amount of a detergent.   
     
     
         2 . The lubricating oil composition of  claim 1 , wherein the detergent comprises a mixed magnesium and calcium detergent system. 
     
     
         3 . The lubricating oil composition of  claim 2 , wherein the mixed magnesium and calcium detergent system has a ratio of calcium to magnesium of less than 2:1. 
     
     
         4 . The lubricating oil composition of  claim 2 , wherein the mixed magnesium and calcium detergent system has a calcium:magnesium ratio of 1.44:1. 
     
     
         5 . The lubricating oil composition of  claim 1 , wherein the CRFM is a high stabilizer CRFM. 
     
     
         6 . The lubricating oil composition of  claim 2 , wherein the CRFM is a high stabilizer CRFM. 
     
     
         7 . The lubricating oil composition of  claim 1 , wherein the CRFM is present in a range of about 2 to 8 wt %, based on the total weight of the composition. 
     
     
         8 . The lubricating oil composition of  claim 1 , wherein nitrogen in the CRFM derived from the tartrimide is present in the range of about 35% to 55 wt %, based on the total nitrogen content of the CRFM. 
     
     
         9 . The lubricating oil composition of  claim 1 , wherein the detergent is selected from the group consisting of: overbased calcium salicylate detergent, low base calcium salicylate detergent, neutral calcium sulfonate detergent, overbased calcium sulfonate detergent and overbased magnesium sulfonate detergent. 
     
     
         10 . The lubricating oil composition of  claim 1 , wherein the detergent is present in the range of about 1 to 10 wt %, based on the total weight of the composition. 
     
     
         11 . The lubricating oil composition of  claim 1 , wherein the base oil comprises a Group III basestock and a polyalphaolefin (PAO) basestock. 
     
     
         12 . The lubricating oil composition of  claim 11 , wherein the Group III basestock is present in a range of about 10 to about 90 wt % and the polyalphaolefin (PAO) basestock is present in a range of about 0 to about 60 wt %, based on the total weight of the composition. 
     
     
         13 . A lubricating oil composition, comprising:
 a base oil comprising a highly paraffinic base oil;   a high stabilizer controlled release friction modifier (CRFM), including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C18-tartrimide, 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500, and 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; and 
   an effective amount of a mixed magnesium and calcium detergent system.   
     
     
         14 . The lubricating oil composition of  claim 13 , wherein the mixed magnesium and calcium detergent system has a ratio of calcium to magnesium of less than 2:1. 
     
     
         15 . The lubricating oil composition of  claim 13 , wherein the mixed magnesium and calcium detergent system has a calcium:magnesium ratio of 1.44:1. 
     
     
         16 . A lubricating oil composition, comprising:
 a highly paraffinic base oil;   a controlled release friction modifier (CRFM), including:
 a tetrahedral borate anion having a boron atom with two bidentate di-oxo ligands both being a linear C18-tartrimide, 
 a first dispersant comprising a conventional ammonium substituted polyisobutenyl succinimide compound having a polyisobutenyl number average molecular weight of 750 to 2,500, and 
 a second dispersant comprising an ammonium substituted polyisobutenyl succinimde compound having an N:CO ratio of 1.8 and a polyisobutylenyl number average molecular weight of 750 to 2,500; and 
   an effective amount of a mixed magnesium and calcium detergent system having a calcium:magnesium ratio of less than 2:1.