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A lubricant composition comprising a major amount of baseoil lubricant and a minor amount of lubricant additive. The lubricant additive includes (a) a dispersant containing at least one member selected from hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adduct

A lubricant composition comprising a major amount of baseoil lubricant and a minor amount of lubricant additive. The lubricant additive includes (a) a dispersant containing at least one member selected from hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from hydrocarbyl-substituted phenols condensed with an aldehyde and an amine, and (b) a viscosity index improver that includes a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography ranging from about 50,000 to about 250,000. The block copolymer is derived from a conjugated diene monomer containing no less than 5 carbon atoms and a monoalkenylarene monomer, wherein the block copolymer has an aromatic content ranging from about 10 wt. % to about 50 wt. % and an olefinic unsaturation ranging from about 0.5 wt. % to about 5 wt. %.

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What is claimed is: 1. A method of reducing wear in an internal combustion engine, comprising: using as the crankcase lubricating oil for said engine a lubricant composition comprising: a major amount of base oil; a first dispersant and a second dispersant each independently comprising at least one

What is claimed is: 1. A method of reducing wear in an internal combustion engine, comprising: using as the crankcase lubricating oil for said engine a lubricant composition comprising: a major amount of base oil; a first dispersant and a second dispersant each independently comprising at least one member selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines; wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight ranging from about 1500 to about 2500 as determined by gel permeation chromatography, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight ranging from about 800 to about 1200 as determined by gel permeation chromatography, and wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises a polymerization product derived from a reaction mixture comprising (i) from about 55 to about 65 weight percent raffinate I stream and (ii) from about 35 to about 45 weight percent isobutylene, with the proviso that (i) and (ii) are different; and a minor viscosity index improving amount of a non-shear stable viscosity index improver comprising a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography ranging from about 50,000 to about 250,000, the block copolymer being derived from a conjugated diene monomer containing no less than 5 carbon atoms and a styrene monomer, wherein the block copolymer has a styrene content ranging from about 30 wt. % to about 40 wt. %, and an olefinic unsaturation ranging from about 0.5 wt. % to about 5 wt. %. 2. The method of claim 1, wherein the conjugated diene monomer comprises isoprene. 3. The method of claim 1, wherein the internal combustion engine is a gasoline or diesel internal combustion engine. 4. The method of claim 1, wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative. 5. The method of claim 1, wherein the first dispersant is a post treated dispersant. 6. The method of claim 1, wherein at least one of the first and second dispersants comprises a Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine. 7. A method for lubricating a crankcase in an internal combustion engine comprising: using in said crankcase a lubricant composition comprising a mineral oil base stock and a lubricant additive in an amount sufficient to enhance the dispersability of particles in the lubricant composition, the lubricant additive comprising: (a) a first dispersant and a second dispersant each independently comprising at least one member selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight ranging from about 1500 to about 2500 as determined by gel permeation chromatography, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight ranging from about 800 to about 1200 as determined by gel permeation chromatography, and wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises the polymerization product of a reaction mixture comprising (i) from about 55 to about 65 weight percent raffinate I stream and (ii) from about 35 to about 45 weight percent isobutylene, with the proviso that (i) and (ii) are different; and (b) a viscosity index improver comprising a substantially linear block copolymer having A number average molecular weight as determined by gel permeation chromatography ranging from about 50,000 to about 250,000, the block copolymer being derived from a conjugated diene monomer containing no less than 5 carbon atoms and a styrene monomer, wherein the block copolymer has a styrene content ranging from about 30 wt. % to about 40 wt. %, and an olefinic unsaturation ranging from about 0.5 wt. % to about 5 wt. %. 8. The method of claim 7, wherein the conjugated diene monomer comprises isoprene. 9. The method of claim 7, wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative. 10. The method of claim 7, wherein the first dispersant is a post treated dispersant. 11. The method of claim 7, wherein at least one of the first and second dispersants comprises a Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine. 12. A method of reducing wear in an internal combustion engine comprising: using as the automatic transmission fluid for said engine a fluid composition comprising a mineral oil base stock and an additive in an amount sufficient to enhance the dispersability of particles in the lubricant composition, the additive comprising: (a) a first dispersant and a second dispersant each independently comprising at least one member selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight ranging from about 1500 to about 2500 as determined by gel permeation chromatography, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight ranging from about 800 to about 1200 as determined by gel permeation chromatography, and wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises the polymerization product of a reaction mixture comprising (i) from about 55 to about 65 weight percent raffinate I stream and (ii) from about 35 to about 45 weight percent isobutylene, with the proviso that (i) and (ii) are different; and (b) a viscosity index improver comprising a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography ranging from about 50,000 to about 250,000, the block copolymer being derived from a conjugated diene monomer containing no less than 5 carbon atoms and a styrene monomer, wherein the block copolymer has a styrene content ranging from about 30 wt. % to about 40 wt. %, and an olefinic unsaturation ranging from about 0.5 wt. % to about 5 wt. %. 13. The method of claim 12, wherein the conjugated diene monomer comprises isoprene. 14. The method of claim 12, wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative. 15. The method of claim 12, wherein the first dispersant is a post-treated dispersant. 16. The method of claim 12, wherein the at least one of the first and second dispersants comprises a Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine. 17. The method of claim 12, wherein the additive comprises the first dispersant in an amount ranging from about 45% to about 65% by weight, relative to the total weight of the additive composition. 18. The method of claim 12, wherein the additive comprises the second dispersant in an amount ranging from about 35% to about 45% by weight, relative to the total weight of the additive composition. 19. The method of claim 12, wherein the fluid composition comprises from about 1% to about 10% by weight of total dispersant, relative to the total weight of the fluid composition. 20. The method of claim 12, wherein the fluid composition comprises from about 3% to about 6% by weight of total dispersant, relative to the total weight of the fluid composition. 21. A method for lubricating moving parts in a drive train of an internal combustion engine comprising: using as the lubricating oil for said drive train a lubricant composition comprising a mineral oil base stock and a lubricant additive in an amount sufficient to enhance the dispersability of particles in the lubricant composition, the lubricant additive comprising: (a) a first dispersant and a second dispersant each independently comprising at least one member selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight ranging from about 1500 to about 2500 as determined by gel permeation chromatography, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight ranging from about 800 to about 1200 as determined by gel permeation chromatography, and wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises the polymerization product of a reaction mixture comprising (i) from about 55 to about 65 weight percent raffinate I stream and (ii) from about 35 to about 45 weight percent isobutylene, with the proviso that (i) and (ii) are different; and (b) a viscosity index improver comprising a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography ranging from about 50,000 to about 250,000, the block copolymer being derived from a conjugated diene monomer containing no less than 5 carbon atoms and a styrene monomer, wherein the block copolymer has a styrene content ranging from about 30 wt. % to about 40 wt. %, and an olefinic unsaturation ranging from about 0.5 wt. % to about 5 wt. %. 22. The method of claim 21, wherein the moving parts comprise a transaxle or gear. 23. The method of claim 22, wherein the conjugated diene monomer comprises isoprene. 24. The method of claim 22, wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative. 25. The method of claim 22, wherein the first dispersant is a post-treated dispersant. 26. The method of claim 22, wherein the at least one of the first and second dispersants comprises a Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine. 27. The method of claim 22, wherein the lubricant additive comprises the first dispersant in an amount ranging from about 45% to about 65% by weight, relative to the total weight of the additive composition. 28. The method of claim 22, wherein the lubricant additive comprises the second dispersant in an amount ranging from about 35% to about 45% by weight, relative to the total weight of the additive composition. 29. The method of claim 22, wherein the lubricant composition comprises from about 1% to about 10% by weight of total dispersant, relative to the total weight of the lubricant composition. 30. The method of claim 22, wherein the lubricant composition comprises from about 3% to about 6% by weight of total dispersant, relative to the total weight of the lubricant composition. 31. The method of claim 1, wherein the lubricant composition comprises from about 1% to about 10% by weight of total dispersant, relative to the total weight of the lubricant composition. 32. The method of claim 1, wherein the lubricant composition comprises from about 3% to about 6% by weight of total dispersant, relative to the total weight of the lubricant composition. 33. The method of claim 1, wherein the lubricant additive comprises the first dispersant in an amount ranging from about 45% to about 65% by weight, relative to the total weight of the additive composition. 34. The method of claim 1, wherein the lubricant additive comprises the second dispersant in an amount ranging from about 35% to about 45% by weight, relative to the total weight of the additive composition. 35. The method of claim 7, wherein the lubricant composition comprises from about 1% to about 10% by weight of total dispersant, relative to the total weight of the lubricant composition. 36. The method of claim 7, wherein the lubricant composition comprises from about 3% to about 6% by weight of total dispersant, relative to the total weight of the lubricant composition. 37. The method of claim 7, wherein the lubricant additive comprises the first dispersant in an amount ranging from about 45% to about 65% by weight, relative to the total weight of the additive composition. 38. The method of claim 7, wherein the lubricant additive comprises the second dispersant in an amount ranging from about 35% to about 45% by weight, relative to the total weight of the additive composition.