Cylinder liner and engine

A cylinder liner for insert casting used in a cylinder block, comprising an upper portion, a middle portion and a lower portion with respect to an axial direction of the cylinder liner,

• wherein a high thermal conductive film is formed on an outer circumferential surface of the cylinder liner to extend over the upper portion but not to extend over the lower portion, and a low thermal conductive film is formed on the outer circumferential surface of the cylinder liner to extend over the lower portion but not to extend over the upper portion and does not extend over the high thermal conductive film at the upper portion, and wherein the high thermal conductive film does not extend over the low thermal conductive film at the lower portion, wherein the high and low thermal conductive films abut, but do not overlap each other.