Lubricating oil compositions

A fuel oil composition having improved lubricity property which contains an additive compositions comprising a lubricity improving amount of the reaction product obtained by the condensation reaction between

• (i) at least one aldehyde or ketone or reactive equivalent thereof,
• (ii) at least one compound comprising one or more aromatic moieties, bearing substituent selected from the group consisting of at least one substituent of the formula —XR1 at least one further substituent —R2, wherein
• X represents oxygen or sulphur,
• R1 represents hydrogen or a moiety bearing at least one hydrocarbyl group having 12-24 carbon atoms;
• and
• R2 represents a hydrocarbyl group and contains less than 18 carbon atoms when linear, and
• (iii) at least one further compound comprising one or more aromatic moieties bearing at least one substituent of the formula —XR1 and at least one further substituent —R3, wherein:
• X represents oxygen or sulphur,
• R1 represents hydrogen or a moiety bearing at least one hydrocarbyl group having 12-24 carbon atoms;
• and
• R3 represents a COOH1 or —SO3H group, and
• wherein X and R1 in reactants (ii) and (iii) may be the same or different.