Fuel oil compositions

A composition of enhanced lubricity without the necessity for the presence of a conventional lubricity enhancing agent comprising a major proportion of a middle distillate petroleum-based fuel oil and a minor proportion of at least one cold flow improver comprising an oil-soluble polar nitrogen compound carrying one or more substituents of the formula >NR13, where R13 represents an alkyl or alkenyl group containing 8 to 40 carbon atoms, which substituent or one or more of which substituents are in the form of a cation derived therefrom, the compound being selected from the group consisting of an amine salt or an amide of a non-cyclic, mono- or poly-carboxylic acid, the sulphur content of the composition being at most 0.05% by weight, wherein the composition has a lubricity such as to give a wear scar diameter, as measured by the HFRR test at 60° C., of at most 500 μm, said amine or amide being prepared by reaction of at least one molar proportion of a hydrocarbyl amine with a molar proportion of the acid or its anhydride.