Oil filter containing an oil soluble thermoplastic additive material therein

An oil filter for engines, hydraulic equipment, or automatic transmissions comprising:

• a casing having first and second ends, and defining an interior volume, and having inlet and outlet openings;
• a particle filtering material comprising loose fibers disposed in said interior volume;
• and
• a plurality of pellets of thermoplastic material which gradually dissolve in above ambient temperature oil, said material having oil oxidation and acidification arresting additives which are released into the oil over time as said material dissolves, said pellets disposed in said interior volume adjacent said loose fibers.

An oil filter for engines, hydraulic equipment, or automatic transmissions comprising:

• a casing having first and second ends, and defining an interior volume, and having inlet and outlet openings;
• a particle filtering material comprising loose fibers disposed in said interior volume;
• and
• a thermoplastic material disposed in said interior volume adjacent said loose fibers, said thermoplastic material having oil oxidation and acidification arresting additives which are released into the oil over time as said material dissolves, said material comprising polypropylene in the form of a plurality of discrete shapes each having a thickness of about 0.0625-0.125 inches.