AMSOIL BMK30 Heavy-Duty By-Pass Oil Filter SystemThe AMSOIL BMK30 is made from high-quality cast aluminum with a steel filter element that has been thoroughly tested in on-road and severe off-road service.

Kit includes mount, hose, hose fittings and EaBP120 Filter element.

Now AMSOIL offers the same technology used in the automotive by-pass filtration mounts for heavy-duty applications. This system offers maximum by-pass filtration performance and protection for heavy-duty applications.


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 powder-coated 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. For more information on engine adapters or the installation of multiple by-pass systems on one application, contact AMSOIL Technical Services at (715) 399-TECH.


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). It 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.

Filter Element Change Interval

AMSOIL recommends changing the EaBP120 every other full-flow filter change up to 120,000 miles (193,000 kilometres), 1800 hours or one year (whichever comes first). 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 Cleantechnics range in price from $500 to $1,000. AMSOIL provides superior filtration performance at  a considerably lower cost. In addition, each new BMK30 comes with a certificate for one free oil analysis from OIL ANALYZERS INC.


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

Sampling Valve (Sold Separately)

AMSOIL BK30 Heavy-Duty Oil Sampling Valve KitAMSOIL 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 kit installs directly onto the AMSOIL BMK30 mount and includes the Deluxe Oil Sampling Valve (G1570). This valve provides 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, hose or engine adapter fittings. The engine adapters are not included due to the kit’s high variability of applications. Before installing a BMK30 kit, determine where the filter mount will be located and how much hose will be needed. The installer must also determine the size of the high- and low-pressure ports in order to determine which engine adapters to purchase. Extra hose is available by the foot from AMSOIL (part # BP250), and adapter fittings can be purchased from any hydraulics or heavy-duty equipment outlet.