Abstract: A filter device for filtering fluid, in particular an oil filter, is provided. The filter device includes a first filter medium and a second filter medium, the first filter medium having a greater filter action than the second filter medium, and the filter media being folded in pleated form and having a plurality of folds, the first filter medium and the second filter medium being connected to one another in the longitudinal direction of the folds. An easily producible and highly effective filter device is thus achieved.

Abstract: The invention relates to an oil filter apparatus comprising an oil inlet and an oil outlet, with a suction oil pump being connectable to the oil outlet with which a negative pressure can be produced between the oil inlet (and the oil outlet, a coarse filter medium and a fine filter medium which is arranged between the oil inlet and the oil outlet, with the oil filter apparatus being capable of allowing a volume share of the oil to pass permanently through the coarse filter medium irrespective of the viscosity of an oil passing through the oil inlet and of allowing at the same time the remaining volume share of the oil to pass through the fine filter medium.

Abstract: A plastic oil pan (1) for engines or transmissions with integrated suction oil filter and integrated pressure oil filter, wherein parts of the oil pan (1) form the base for suction oil filter housing (2) and pressure oil filter housing (7), wherein a one-component or multi-component cover (3, 8) is arranged as oil filter upper tray (3, 8) for the suction oil filter housing (2) and the pressure oil filter housing (7), and wherein at least one pressure oil filter inlet (10) is arranged at the pressure oil filter side and at least one suction oil filter outlet (5) at the suction oil filter side in the oil filter upper tray, wherein a one-component or multi-component oil filter medium (4, 9) is arranged between oil pan (1) and oil filter upper tray (3, 8), wherein a suction oil filter inlet (6) is arranged beneath the suction oil filter medium (4) and a pressure oil filter outlet (11) is arranged beneath the pressure oil filter medium (9), and wherein the pressure oil filter outlet (11) and the suction oil filter