Abstract: A filter assembly comprises a housing open at one end, a filter element therein, and a plate at the open end enclosing the filter element within the housing. The filter assembly further includes a fluid flow control assembly disposed between an end of the filter element and the plate. The fluid flow control assembly includes a check valve and a relief valve seat upon which the check valve abuts to prevent flow of fluid through a by-pass passage. The check valve is held in a sealed position against the relief valve seat by a biasing member retained by the relief valve seat. The force of the biasing member is overcome when pressure in the fluid acting upon the check valve reaches or exceeds a certain level, causing the check valve to move away from the relief valve seat, and permitting the fluid to flow through the relief valve assembly to an outlet opening of the filter assembly, bypassing the filter element of the filter assembly.

Abstract: A filter assembly comprises a housing open at one end and holding a filter element therein and a plate closing the open end of the housing and enclosing the filter element within the housing. The plate includes at least two first inlet openings, at least two second inlet openings, and a central outlet opening. The filter assembly further includes a fluid flow controller disposed between an end of the filter element and the plate. The flow controller includes a relief valve comprising a first portion cooperating with the first inlet openings and a second portion cooperating with the second inlet openings; and biasing means operatively connected to the relief valve and providing resistance to movement of the second portion of the relief valve.

Abstract: An oil-conditioning filter, for use with an internal combustion engine, includes a filter element and an additive cartridge, for gradually dispensing an oil additive over time. The additive cartridge has a beneficial oil-conditioning agent contained therein. Placement of the cartridge allows for fluid filtration through the filter element before fluid communication with the additive of the additive cartridge. An additive dispersing member is also described.