Lubricant Compositions with Reduced Phosphorous Content for Engines having Catalytic Converters

Abstract

A lubricant composition is disclosed. The lubricant composition is made up of (a) ashless dispersant; (b) metal-containing detergent; (c) a phosphorus-containing compound; (d) rust inhibitor; and (e) basestock, wherein the lubricant composition has a concentration of phosphorus less than or equal to 0.08 weight %.

1 . A lubricant composition comprising:
 a. ashless dispersant;   b. metal-containing detergent.   c. a phosphorus-containing compound;   d. rust inhibitor; and   e. base stock, wherein the lubricant composition has a concentration of phosphorus equal to or less than to 0.08 mass %.   
     
     
         2 . The lubricant composition according to  claim 1 , wherein the rust inhibitor is present in an amount capable of providing protection against rust that is equal to or better than the performance of NMMA reference oil 5973 in the NMMA FC-W Rust Test when reference oil 5973 is within the range of 20-40% rust. 
     
     
         3 . The lubricant composition according to  claim 2 , wherein the rust inhibitor is present in a amount ranging from 0.1 to 2.0 weight percent, based on the total weight of the lubricant composition. 
     
     
         4 . The lubricant composition according to  claim 1  wherein the ashless dispersant is selected from the group comprising of hydrocarbyl succinimides, hydrocarbyl succinamides, mixed ester/amides of hydrocarbyl-substituted succinic acid, hydroxyesters of hydrocarbyl-substituted succinic acid, Mannich condensation products of hydrocarbyl-substituted phenols, formaldehyde, polyamines and mixtures thereof. 
     
     
         5 . The lubricant composition according to  claim 1  wherein the ashless dispersant is present in an amount ranging from 1.1 to 18.5 weight percent based on the total weight of the lubricant composition. 
     
     
         6 . The lubricant composition according to  claim 1  wherein the metal-containing detergent is selected from the group comprising oil-soluble neutral and overbased sulfonates, phenates, sulfurized phenates, thiophosphonates, salicylates, and naphthenates, other oil-soluble carboxylates of a metal and mixtures thereof. 
     
     
         7 . The lubricant composition according to  claim 1  wherein the metal-containing detergent is present in an amount ranging from 0.2 to 3.0 weight percent, based on the total weight of the lubricant composition. 
     
     
         8 . The lubricant composition according to  claim 1  wherein the basestock is selected from the group comprising Group I blended oils, Group II blended oils, Group III blended oils, Group IV blended oils, Group V blended oils and mixtures thereof. 
     
     
         9 . The lubricant composition according to  claim 1  further comprising a molybdenum-containing compound. 
     
     
         10 . The lubricant composition according to  claim 9  wherein the molybdenum-containing compound is present in an amount to provide a concentration of molybdenum ranging from 0.001 to 1.0 weight percent, based on the total weight of the lubricant composition. 
     
     
         11 . The lubricant composition according to  claim 1  wherein the phosphorus-containing compound is ZDDP. 
     
     
         12 . The lubricant composition according to  claim 1  further comprising one or more of the following, friction modifiers, viscosity modifiers, stabilizers, oxidation inhibitors, demulsifiers, antifoam additives, tackifiers and pour depressants. 
     
     
         13 . A marine lubricant composition comprising:
 a. ashless dispersant;   b. metal-containing detergent;   c. a phosphorus-containing compound;   d. rust inhibitor; and   e. base stock, wherein the lubricant composition has a concentration of phosphorus equal to or less than 0.08 mass % and is formulated to meet the requirements of the National Marine Manufacturers Association (NMMA) FC-W specification.   
     
     
         14 . The marine lubricant composition according to  claim 13  further comprising a molybdenum-containing compound. 
     
     
         15 . The marine lubricant composition according to  claim 14  wherein the molybdenum-containing compound is present in an amount to provide a concentration of molybdenum ranging from 0.001 to 1.0 weight percent, based on the total weight of the lubricant composition. 
     
     
         16 . The marine lubricant composition according to  claim 13  wherein when the lubricant composition is subjected to ASTM D4683, it exhibits an HTHS viscosity equal to or greater than 3.3 cP at 150° C. after being subjected to 30 cycles of shear as described in ASTM D6278 Shear Stability test. 
     
     
         17 . A method for lubricating a catalyst-equipped, 4-stroke marine engine comprising:
 lubricating the engine with a lubricant composition comprising ashless dispersant; metal-containing detergent; a phosphorus-containing compound; rust inhibitor; and base stock, wherein the lubricant composition has a concentration of phosphorus less than or equal to 0.08 mass %.