Heavy-Duty Bypass System

Outstanding filtration efficiency for maximum oil life and engine protection

The AMSOIL Heavy-Duty Bypass System (BMK30) provides superior filtration performance for heavy-duty on- and off-road applications. It is designed specifically for the AMSOIL Heavy-Duty Bypass Filter (EABP120).

Bypass Basics

Bypass oil filtration introduces a secondary filter with the purpose of eliminating nearly all contaminants from engine oil. They have high capacities and eliminate much smaller particles than full-flow filters, including soot. The bypass filters reduce engine wear through high filtering efficiency, which means they have higher restriction and must be used in conjunction with a full-flow filter.

Bypass filters operate by filtering oil on a “partial-flow” basis. They draw less than 5 percent of the oil pump’s capacity at any one time and trap the extremely small, wear-causing contaminants that full-flow filters can’t remove. They have a high pressure differential, causing the oil to flow through them very slowly and allowing for the removal of smaller contaminants. It is called bypass filtration because the oil flows from the bypass filter back to the sump and bypasses the engine. This continual process eventually cleans all the oil in the system, reduces long-term wear and can dramatically extend the life of the engine.

AMSOIL Heavy-Duty Bypass System

The AMSOIL Heavy-Duty Bypass System includes the mount, mounting hardware, 15 feet of hose, hose fittings, installation instructions and AMSOIL Bypass Filter (EABP120). Fitting suggestions and fitting locations can be found on the Heavy-Duty Bypass webpage at AMSOIL.com. Available separately, the oil sample valve (BK30) eases the process of collecting oil samples. The system provides most of the necessary fittings, except the fitting required to pull pressurized oil from the engine and the return fitting to return oil to the sump. Other parts and fittings can be purchased from any hydraulics or heavy-duty equipment outlet.

Heavy Duty Bypass Filtration System G2552
Heavy-Duty Bypass System

• Superior filtration performance for heavy-duty on- and off-road applications
• Helps extend engine life
• Efficient removal of small particles and soot that full-flow oil filters can’t capture alone
• Improved oil cooling
• Reduces maintenance costs


High-Quality, Durable Construction

The AMSOIL Heavy-Duty Bypass Filtration System is constructed of high-quality cast aluminum with a steel filter stud 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.

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