Patent ID: 7377252

Claim:
An internal combustion engine provided with an oil filter for cleaning lubricant oil discharged by a positive-displacement oil pump, said oil filter comprising: a filter base attached to an engine body of the internal combustion engine; and an oil filter body attached to the filter base, said oil filter body having a base part with a joining surface closely joined to the filter base, and a head part opposite the base part; wherein the oil filter body is provided with a cover having a base part formed integrally with the filter base and a head part axially opposite the base part of the cover, said cover circumferentially surrounding the oil filter body, the oil filter body and the cover forms a space between the oil filter body and the cover, the cover is provided with a window part through which the space opens diametrically outward, and the cover has a circumferentially endlessly continuous part in a region axially extending between the window part and the head part of the cover.