The invention relates to an oil filter unit (1) as suction filter unit, in particular as a transmission oil filter unit or as a motor oil filter unit for internal combustion engines. The oil filter unit (1) comprises an oil filter housing which has an inlet (4) and an outlet (5), wherein at least one first, one second, and one third filter medium (6, 7, 8) are arranged within the oil filter housing. The filter media (6, 7, 8) are arranged spaced apart from each other. The filter media (6, 7, 8) delimit at least one first and one second filter chamber (67, 78), the first and the second filter medium (6, 7) are provided with a first filter bypass, the first filter bypass defines a filter-free fluid connection between the inlet (4) and the second filter chamber or between the inlet (4) and a further filter chamber, the second and the third filter medium (7, 8) have a second filter bypass and the second filter bypass defines a filter-free fluid connection between the first filter chamber (67) and the outlet (5).