an oil filter for use in heavy duty internal combustion engines is disclosed herein . the oil filter includes an exterior tube with perforations , an interior tube with perforations , a spring located inside the interior tube , a lower and an upper end cap attached to first and second ends of the exterior and interior perforated tubes , respectively , and two pleated layers of filter media concentrically located between the interior and exterior perforated tubes without any stabilizing means located between the layers of filter media . the two layers of filter media are formed of a substantial portion of pulp of fibers that contain lignin to reduce softening and swelling of the filter media upon contact with water .