Dispersant

An automotive lubricant composition comprising a base fluid and an ashless polymeric dispersant having a number average molecular weight of between 200 and 15,000, wherein the dispersant is derived from the reaction of a polar head group, which comprises a polar moiety having more than one amine, alcohol, acid or halogen functionality with two or more polar tail groups where each polar tail group comprises a polymeric backbone of 2 to 30 monomeric repeat units, each repeat unit comprising a hydrocarbon chain functionalised by the presence of at least one electronegative element or moiety.

Use of an automotive lubricant composition comprising a base fluid and 0.001 to 20% by weight of a polymeric ashless dispersant having a number average molecular weight of between 200 and 15,000 wherein the dispersant is derived from the reaction of a polar head group, which comprises a polar moiety having more than one amine, alcohol, acid or halogen functionality with two or more polar tail groups where each polar tail group comprises a polymeric backbone of 2 to 30 monomeric repeat units, each repeat unit comprising a hydrocarbon chain functionalised by the presence of at least one electronegative element or moiety in an engine or a transmission or a fuel supply line.

Use of an ashless polymeric dispersant having a number average molecular weight of between 200 and 15,000, wherein the dispersant is derived from the o reaction of a polar head group, which comprises a polar moiety having more than one amine, alcohol, acid or halogen functionality with two or more polar tail groups where each polar tail group comprises a polymeric backbone of 2 to 30 monomeric repeat units, each repeat unit comprising a hydrocarbon chain functionalised by the presence of at least one electronegative element or moiety in an engine or transmission oil or a 5 fuel.