An improved oil conditioning filter, for use with an internal combustion
engine, includes a mechanically active filter element and a chemically
active filter element containing a beneficial additive therein. The
beneficial additive is provided to extend the useful life of lubricating
oil in an internal combustion engine. The beneficial additive may include
an antioxidant, an anti-wear agent, and/or a basic salt. In a preferred
embodiment of the invention, the chemically active conditioning agent is
provided in a plurality of particles disposed within the oil filter
housing. The particles may be bonded together to form an integral porous
filter element having spaces defined between the particles thereof. The
particles are made either by a hot extrusion process or by a solvent
process.