Staged oil filter incorporating timed release oil conditioner

An oil filter, comprising:

• a hollow filter housing having an inlet and an outlet and defining a chamber therein with a flow path between the inlet and outlet;
• a mechanically active filter member disposed inside the housing in the flow path;
• and
• a chemically active filter member disposed inside the housing in the flow path;
• wherein the chemically active filter member comprises a plurality of additive-dispensing modules,
• each of said additive-dispensing modules comprising:
• a module housing which is a hollow shell having a plurality of holes formed therein;
• an oil additive composition disposed within the housing;
• and
• a porous or semi-porous polymeric membrane covering at least part of the housing.

A supplemental cartridge for use in conjunction with an oil filter, said supplemental cartridge comprising:

• a hollow cartridge housing, comprising
• a base plate for placement proximate an engine surface, said base plate having an outlet aperture formed substantially centrally therethrough and an inlet aperture formed therethrough and spaced apart from said outlet aperture;
• a cap opposite said base plate for placement proximate an oil filter, said cap having an inlet aperture formed substantially centrally therethrough and an outlet aperture formed therethrough and spaced apart from said inlet aperture;
• an outer wall connecting said cap and said base plate;
• a dividing wall member disposed within said housing and separating said housing interior into an inlet flow channel in fluid communication with said inlet aperture of said base plate, and an outlet flow channel in fluid communication with said outlet aperture of said base plate;
• and
• a chemically active filter member disposed within said inlet flow channel of said housing, said chemically active filter member comprising a plurality of additive-dispensing modules,
• each of said additive-dispensing modules comprising:
• a module housing which is a hollow shell having a plurality of holes formed therein;
• an oil additive composition disposed within the module housing;
• and
• a porous or semi-porous polymeric membrane covering the module housing.