Agent for improving fluidity of fuel oil and fuel oil composition

摘要

Provided is an agent for improving the fluidity of a fuel oil with which clogging, fluidity, and wax dispersibility can be sufficiently improved, even in a vehicle having a fine-mesh fuel filter in the fuel supply line. The agent for improving fluidity of a fuel oil comprises the following ester compound (A) and the following copolymer (B) wherein the mass ratio [(A)/(B)] of ester compound (A) and copolymer (B) is between 30/70 and 70/30. The ester compound (A) is represented by formula (I) where R