Filter medium and filter cartridge

A filter cartridge for an oil filter, said filter cartridge comprising a web of a filter medium locatable within a tubular housing of the oil filter, said filter medium having a first layer composed of cellulose pulp, said first layer having a first porosity;

• and at least one strip of cellulose pulp and a fiber material selected from the group consisting of glass, polyester, polyethylene and polyamide fibers, said at least one strip having a second porosity that is finer than said first porosity, said at least one strip forming a second layer adhered to and partly covering said first layer, the first and second layers forming on said filter cartridge, as a single unit, three separate filter regions, two of which are in series and the third one which is in parallel with the first two.

A filter medium comprising:

• at least one first filtering region made of a layer of cellulose pulp, said first filtering region having a first porosity;
• and
• at least one second filtering region, said second filtering region being made of a layer of cellulose pulp to which is adhered at least one layer of cellulose pup and fiber material selected from the group consisting of glass, polyester, polyethylene and polyamide fibers, said layer of cellulose pulp and fiber material of said second filtering region having a second porosity that is finer than said first porosity.