The oil flows through 114 millimeters of a cellulose material with progressive density. The larger particles are trapped in the upper portions, where they can be observed as a diagnostic tool. Smaller particles are trapped deeper in the media where its more tightly packed. A major side benefit to Racor’s new filter is the ability to trap up to 200 ml (6.7 fluid ounces) of water, as well as resins and “soft” oxidation residue before it turns into sludge or varnish. These are things few filters can do and it’s a great oil life extender.