AMSOIL Dual-Gard Bypass Filter System
AMSOIL Dual-Gard™ Bypass Filter System
August 26, 2015
Show all

AMSOIL Single Remote Bypass Filter System

Engine compartments are becoming increasingly cramped, leaving little room for after-market additions and improvements. The AMSOIL Universal Single-Remote Bypass System solves that issue and provides superior bypass filtration performance while working in conjunction with the engine’s full-flow oil filter. This system connects to the engine through a pressurized oil port. System includes mount, mounting hardware, hose and hose fittings. Note: The EaBP bypass oil filter is sold separately. EaBP120 will not work with this system. AMSOIL EaBP Bypass Filters have an absolute efficiency of 98.7 percent (Beta 75) at TWO microns, and about 60% below 1 micron, thus virtually eliminating engine wear from particles.

Buy Now

SKU: BMK21 Category:

Universal Single-Remote Bypass Filtration System

Engine wear is caused by dirt particles of about 5 microns. Bypass filtration removes particles less than one micron or larger, virtually eliminating engine wear. Filters all of the oil in a 6 quart system in about 5 minutes. Without bypass filter element – 1 required. For use with EaBP90, EaBP100 or EaBP110 Element.

PDF5 Warranty

See Bypass Installation Samples

The Ea Bypass 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 Bypass 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.

Typical Installation Diagram for BMK21 Kit.

BMK21 Installation and Servicing Instructions

See the Bypass Replacement Parts Lists





Higher Efficiency

AMSOIL EaBP Filters have an efficiency of 98.7 percent at two microns. At normal operating RPMs the EaBP Filter will filter all of the oil in a typical five quart sump in less than 10 minutes.

Superior Construction
The superior construction of AMSOIL EaBP Filters provides better sealing and increased longevity along with superior corrosion resistance. AMSOIL EaBP Filters have a marine powder coated exterior; and their zinc-dichromate base plates increase rust protection. EaBP Filters have a nitrile HNBR gasket and an orange silicone anti-drain valve. The two stage pleated and layered cellulose/full synthetic media has an efficiency rating of 98.7 percent at two microns.

Longer Lasting
AMSOIL Bypass Filters can be utilized over an extended period of mileage, hours or years as outlined in the Chart below. Oil analysis is recommended for extended drain intervals.

Increased Oil Capacity
The increased fluid system capacity and filtration life provides improved oil cooling and ensures that equipment constantly runs on clean oil. Engine efficiency is increased, providing extended engine life.

Soot Removal
AMSOIL has designed a high-efficiency Bypass filter element that is also a soot removal device. AMSOIL Ea Bypass Filters use a synthetic/cellulose sandwiched media. The inner layer of the element is composed of a highly efficient cellulose media covered with a full synthetic media outer layer. These filters remove 39 percent of soot contaminants less than one micron. Soot removal efficiency increases approximately 10 to 14 percent when the EaBP Filter is used in conjunction with a standard full-flow filter.

Bypass Filtration Benefits

  • Dramatically Extended Drain Intervals
  • Improved Oil Cooling
  • Increased Filtration Capacity and Life
  • Increased Fluid System Capacity
  • Efficient Small Particle and Soot Removal
  • Significantly Extended Engine Life
  • Equipment Constantly Runs on Clean Oil
  • Increased Engine Efficiency
  • Remove Particles Less Than One Micro


AMSOIL Bypass Filter Replacement Chart
Type of Unit Stock Number Size (Approx.) Additional Oil Needed Crankcase Capacity Applications
SINGLE SPIN-ON ELEMENT(Used with BMK21 or any DUAL REMOTE SYSTEM) EaBP90 Diam. = 4.5 in.
Height = 6 in.
With Mnt. = 8 in.
1 qt. up to 15 qt. Pleasure Vehicles, Light Trucks and Smaller Commercial Applications
EaBP100 Diam. = 4.5 in.
Height = 8 in.
With Mnt. = 10 in.
1.5 qt. up to 18 qt.
EaBP110 Diam. = 4.5 in.
Height = 10 in.
With Mnt. = 12 in.
2 qt. up to 24 qt.
DUAL SPIN-ON ELEMENT(Used with BMK22 DUAL-GARD) (2) EaBP90 Diam. = 5 in.
Height = 5.8 in.
With Mnt. = 8 in.
2 qt. 15 to 30 qt. Large Trucks, Construction, Farm and Industrial Equipment(minimum sump capacity = 15 qt.)
(2) EaBP100 Diam. = 5 in.
Height = 7.3 in.
With Mnt. = 10 in.
3 qt. 15 to 36 qt.
(2) EaBP110 Diam. = 5 in.
Height = 10.4 in.
With Mnt. = 12 in.
4 qt. 15 to 48 qt.
Heavy-Duty Bypass System)
(1) EaBP120 Width = 5.35 in.
Length = 12.12 in.
Height = 17.5 in.
4 qt. 24 to 60 qt. Large Trucks, Construction, Farm and Industrial Equipment, (minimum sump capacity = 15 qt.), the BMK30 kit can be mounted in series for sump capacities greater than 60 quarts.

Filter Service Intervals
Ea Bypass Filters offer long service life. Do not exceed the limits listed in the chart below.

EaBP90 EaBP100 EaBP110
Mileage 60,000 70,000 80,000
Hours 600 800 1,200
Time 2 years 2 years 2 years

BMK21 Packaging Information


Code Part Number Unit of Measure Product
BMK21-EA BMK21 Each Bypass Filter Mounting Kit – 1 bypass filter mount kit