Abstract: Certain UV filter compounds improve the combustion properties of diesel fuel compositions, and in particular modify the ignition delay and/or modify the burn period and/or modify the peak pressure and/or increase the cetane number of the liquid fuel composition. A liquid fuel composition is provided containing: (a) a diesel base fuel suitable for use in an internal combustion engine; and (b) in the range of 10 ppmw to 2 wt %, by weight of the liquid fuel composition, of one or more organic UV filter compounds selected from imidazoles, triazines, triazones and triazoles, and mixtures thereof.

Abstract: The use of imidazolium salts (I) where R1 and R3 are each independently an organic radical having 1 to 3000 carbon atoms, R2, R4 and R5 are each independently hydrogen or an organic radical having 1 to 3000 carbon atoms, X is an anion and n is the number 1, 2 or 3 as additives for fuels, especially as detergent additives for diesel fuels, as wax antisettling additives for middle distillate fuels and as lubricity improvers, and for improving the use properties of mineral and synthetic nonaqueous industrial fluids.

Abstract: A fuel composition comprising a major amount of hydrocarbon fuel and a minor lubricity improving amount of a composition made by reacting component (A) with component (B) under unit-forming conditions; component (A) comprising a carboxylic acid represented by the formula R (COOH)n wherein R is a hydrocarbon group of 2 to 30 carbon atoms and n is a number in the range of 1 to 4, or an anhydride of said acid; and component (B) comprising a heterocylic aromatic amine.