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Heavy-Duty By-Pass System

Product Code: BMK30

The Ea By-Pass Oil Filter (EaBP) provides the best possible filtration protection against wear and oil degradation. Working in conjunction with the engine's full-flow oil filter, the AMSOIL Ea By-Pass Filter operates by filtering oil on a "partial-flow" basis. It draws approximately 10 percent of the oil pump's capacity at any one time and traps the extremely small, wear-causing contaminants that full-flow filters can't remove. The AMSOIL Ea Bypass Filter typically filters all the oil in the system several times an hour, so the engine continuously receives analytically clean oil

Data Sheet

The EaBP120 Filter and hose (BP250) must be purchased separately. See Below.


The BMK30 is made from high-quality cast aluminum with a steel filter spud that has been thoroughly tested in on-road and severe off-road service. The mount is finished with a thick layer of powdercoated paint to provide maximum resistance to the degrading effects of road salt, debris and engine compartment chemicals. In addition, BMK30 By-Pass Filtration Systems can be plumbed in a series to provide maximum filtration protection for large V12 and V16 engines. The filter mount features a 3⁄8" NPT connector that connects the outlet and inlet of adjacent filter mounts.

AMSOIL EaBP120 Filter

The EaBP120 features the same synthetic nanofiber media as the rest of the Ea By-Pass Filter family. The EaBP120 removes 98.7% of all contaminants two microns in size or larger (ISO 4548-12), and provides an industry-leading soot-removal efficiency of 39% for particles less than one micron in size (ISO 23556). It comes complete with a marine powder-coated finish for long filter life, even in extreme conditions. AMSOIL recommends changing the EaBP120 every other full-flow filter change up to 90,000 miles. Extended oil drain intervals should always be accompanied by an oil analysis program.

Competitive Pricing

The AMSOIL BMK30 and EaBP120 provide state-of-the-art filtration performance at a price hundreds of dollars less than the competition. Similar products from competitors such as Gulf Coast, Spinner Centrifuge, Oil Purification System, Advanced Filtration Solutions and Clean techniques, with no hoses or fittings, range in price from $500 to $1,000. AMSOIL provides superior filtration performance for considerably lower cost. In addition, each new BMK30 comes with a certificate for one free oil analysis from OIL ANALYZERS INC.

Product Applications

The AMSOIL BMK30 and EaBP120 provide maximum filtration performance for virtually all heavy-duty diesel applications, including Class 6, 7 and 8 heavy-duty trucks, off-road equipment, buses, generators, marine engines, logging and agricultural equipment.

Sample Valve Kit for BMK30


Product Code: BK30

AMSOIL now offers a Heavy-Duty By-Pass Oil Sampling Kit (BK30) designed for use with the AMSOIL Heavy-Duty By-Pass Filtration System (BMK30). The new kit installs directly onto the AMSOIL BMK30 mount and includes the Deluxe Oil Sampling Valve (G1570), providing oil samples at the push of a button. The Heavy-Duty By-Pass Oil Sampling Kit makes taking oil samples much easier, cleaner and more convenient.


The BMK30 comes with all necessary hose-end fittings and mounting bolts, but does not include the filter, hose or engine adapter fittings. The hose and engine adapters are not included due to the kit's high variability of application. Before installing a BMK30 kit, determine where the filter mount will be located and how much hose will be necessary to complete the installation. The installer must also determine the size of the high- and low-pressure ports in order to determine which engine adapters to purchase. Hose is available by the foot from AMSOIL (BP250), and adapter fittings can be purchased from any hydraulics or heavy-duty equipment outlet.

EaBP120 Filter
BP250 Hose


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