A lubricant composition comprising a major amount of base oil and a minor amount of a lubricant additive, said lubricant additive comprising (a) a dispersant mixture comprising (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight of 1500 to 2500 as determined by gel permeation chromatography, and (ii) a second dispersant comprising a hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight of 800 to 1200 as determined by gel permeation chromatography, wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises a polymerization product derived from a reaction mixture comprising 35 to 45 weight percent isobutylene and 55 to 65 weight percent raffinate I stream; and (b) a viscosity index improver comprising a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography of 50,000 to 250,000, the block copolymer having an A block derived from a monoalkenylarene monomer and a B block derived from a conjugated diene monomer containing no less than 5 carbon atoms, wherein the block copolymer has an aromatic content of 10 wt.% to 50 wt.% and an olefinic unsaturation of 0.5 wt.% to 5 wt.%; wherein - the lubricant composition contains from 0.05% to 35% by weight of the viscosity index improver based on the total weight of the lubricant composition; - the first dispersant is present in the dispersant mixture in an amount ranging from 30 to 70 % by weight of the mixture, and the second dispersant is present in the dispersant mixture in an amount ranging from 70 to 30 % by weight of the mixture; and - the total amount of dispersant in the lubricant composition is from 1 to 10% by weight based on the total weight of the lubricant composition. (a) a dispersant mixture comprising (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight of 1500 to 2500 as determined by gel permeation chromatography, and (ii) a second dispersant comprising a hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight of 800 to 1200 as determined by gel permeation chromatography, wherein the hydrocarbyl-substituent of at least one of the first and second dispersants comprises a polymerization product derived from a reaction mixture comprising 35 to 45 weight percent isobutylene and 55 to 65 weight percent raffinate I stream; and (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the first dispersant has a number average molecular weight of 1500 to 2500 as determined by gel permeation chromatography, and (ii) a second dispersant comprising a hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine or Mannich base adduct derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent of the second dispersant has a number average molecular weight of 800 to 1200 as determined by gel permeation chromatography, (b) a viscosity index improver comprising a substantially linear block copolymer having a number average molecular weight as determined by gel permeation chromatography of 50,000 to 250,000, the block copolymer having an A block derived from a monoalkenylarene monomer and a B block derived from a conjugated diene monomer containing no less than 5 carbon atoms, wherein the block copolymer has an aromatic content of 10 wt.% to 50 wt.% and an olefinic unsaturation of 0.5 wt.% to 5 wt.%; wherein - the lubricant composition contains from 0.05% to 35% by weight of the viscosity index improver based on the total weight of the lubricant composition; - the first dispersant is present in the dispersant mixture in an amount ranging from 30 to 70 % by weight of the mixture, and the second dispersant is present in the dispersant mixture in an amount ranging from 70 to 30 % by weight of the mixture; and - the total amount of dispersant in the lubricant composition is from 1 to 10% by weight based on the total weight of the lubricant composition. - the lubricant composition contains from 0.05% to 35% by weight of the viscosity index improver based on the total weight of the lubricant composition; - the first dispersant is present in the dispersant mixture in an amount ranging from 30 to 70 % by weight of the mixture, and the second dispersant is present in the dispersant mixture in an amount ranging from 70 to 30 % by weight of the mixture; and - the total amount of dispersant in the lubricant composition is from 1 to 10% by weight based on the total weight of the lubricant composition.