Lubricating Oil Composition

Abstract

The use, in a lubricating oil composition comprising base oil, of one or more magnesium detergents, for the reduction of clogging in a diesel particulate filter.

1 . A method for reducing clogging in a diesel particulate filter during operation of a diesel engine that is lubricated with a lubricating oil, the method comprising including in the lubricating oil at least one magnesium detergent.  
   
   
       2 . The method according to  claim 1 , wherein the clogging is measured by the VW diesel particulate filter test.  
   
   
       3 . The method according to  claim 1  wherein the lubricating oil composition has a sulphated ash content of not greater than 1.0 wt. %, based on the total weight of the lubricating oil composition.  
   
   
       4 . The method according to  claim 1  wherein the magnesium detergent is selected from the group consisting of magnesium salicylate detergents, magnesium phenate detergents, magnesium sulphonate detergents, and combinations thereof.  
   
   
       5 . The method according to  claim 4  wherein said at least one magnesium detergent has a TBN (total base number) value in the range of from 30 to 600 mg.KOH/g, as measured by ISO 3771.  
   
   
       6 . The method according to  claim 1  wherein the base oil is selected from the group consisting of mineral oil, synthetic oil, and combinations thereof.  
   
   
       7 . The method according to  claim 1  wherein the magnesium detergent is present in a total amount of not greater than 0.2 wt. % in terms of magnesium content, based on the total weight of the lubricating oil composition.  
   
   
       8 . The method according to  claim 1  wherein the lubricating oil composition has a phosphorus content in the range of from 0.04 to 0.1 wt. %, based on the total weight of the lubricating oil composition.  
   
   
       9 . The method according to  claim 1  wherein the lubricating oil composition further comprises one or more additives selected from anti-oxidants, anti-wear additives, supplementary detergents, dispersants, friction modifiers, viscosity index improvers, pour point depressants, corrosion inhibitors, defoaming agents and seal fix or seal compatibility agents.  
   
   
       10 . A method of improving performance in a diesel particulate filter test, comprising lubricating an internal combustion engine with a lubricating oil composition containing a magnesium compound.  
   
   
       11 . The method according to  claim 1  wherein the filter weight increases less than 50% after 450 hours of operation, as measured by the VW diesel particulate filter test.  
   
   
       12 . A method for reducing clogging in a diesel particulate filter during operation of a diesel engine that is lubricated with a lubricating oil, the method comprising: 
 including in the lubricating oil at least one magnesium detergent;    wherein the lubricating oil composition has a sulphated ash content of not greater than 1.0 wt. % and a phosphorus content in the range of from 0.04 to 0.1 wt. %, based on the total weight of the lubricating oil composition; and    wherein the magnesium detergent is present in a total amount of not greater than 0.2 wt. % in terms of magnesium content, based on the total weight of the lubricating oil composition.    
   
   
       13 . The method according to  claim 12  wherein the magnesium detergent is selected from the group consisting of magnesium salicylate detergents, magnesium phenate detergents, magnesium sulphonate detergents, and combinations thereof.  
   
   
       14 . The method according to  claim 12  wherein the base oil is selected from the group consisting of mineral oil, synthetic oil, and combinations thereof.  
   
   
       15 . The method according to  claim 12  wherein the lubricating oil composition further comprises one or more additives selected from anti-oxidants, anti-wear additives, supplementary detergents, dispersants, friction modifiers, viscosity index improvers, pour point depressants, corrosion inhibitors, defoaming agents and seal fix or seal compatibility agents.  
   
   
       16 . The method according to  claim 12  wherein the filter weight increases less than 50% after 450 hours of operation, as measured by the VW diesel particulate filter test.