USE OF A VISCOSITY INCREASING COMPONENT IN A DIESEL FUEL

摘要

Use of a viscosity increasing component in a diesel fuel composition, to improve the acceleration performance, at low engine speeds (for example up to 2200 rpm), of a turbo charged diesel engine into which the composition is introduced. This use may be for reducing the engine speed at which the turbo charger reaches its maximum speed when accelerating at low engine speeds, or reducing the time taken for the turbo charger to reach its maximum speed. It may mitigate a deterioration in the acceleration performance of the engine due to another cause. The VK 40 of the resultant fuel composition is suitably 2.8 mm2/s (centistokes) or greater. The viscosity increasing component may in particular be a Fischer-Tropsch derived fuel component, an oil or a fatty acid alkyl ester. A density increasing component may be used in the fuel composition together with the viscosity increasing component.