PURPOSE: To provide the titled fuel oil composition which contains a low-temperature fluidity improving agent consisting of a combination of a specified organic high-molecular substance with an epoxy group linked to a main chain high-molecular segment and an amine compd. and exhibits improved fluidity at low temperature.

CONSTITUTION: The composition is prepared by adding 0.001W5wt% low-temperature fluidity improving agent to a fuel oil consisting of at intermediate distillate from petroleum. The improver is made by combined use of (A) an organic high-molecular compd. consisting of a main chain high-molecular segment with a molecular weight of 200W10,000 and an epoxy group of formula I (wherein R1 and R2 are H or methyl; X is H or a bond; When X is a bond, carbon atom to which R1 and R2 are linked may form a part of the main chain) which is linked to the above segment, and containing the epoxy group in an amount of 0.05W2mol per 100g of the compd. and (B) an amine compd. of formula II(where R3 and R4 are each a 12C or higher organic group of H).