An AMSOIL Bypass System introduces a secondary bypass filter that is used in conjunction with the vehicle’s current full-flow filter to better protect your engine. AMSOIL Ea Bypass Filters can efficiently remove particles down to 2 microns in size. To learn more about bypass systems click here.

Installing a bypass system has many benefits. It can help remove small contaminants from your oil, extending engine life. To learn more about bypass filtration and its benefits click here.

Yes, an AMSOIL Bypass System can be used in nearly any application, from passenger vehicles to heavy-duty systems. If you do not see your specific application, choose a Universal Single-Remote or Universal Dual-Remote System, along with the appropriate adapter(s) for your application. If there are not adapters available for your application, you can still install a system by using different parts available from AMSOIL. Contact AMSOIL Technical Services (715-399-TECH or [email protected]) for more information.

Yes, an AMSOIL Bypass System can be used in nearly any application, from passenger vehicles to heavy-duty systems. While bypass filtration is beneficial in all applications, it has the most benefit in diesel applications due to the high soot content.

An AMSOIL Bypass System could be used in a racing application, but due to the extreme conditions presented in racing vehicles, AMSOIL cannot warranty a system used for this purpose.

There are a number of locations where an AMSOIL Bypass System could be mounted. When looking for a location to mount your system, keep the following in mind:

  1. The mount should be located as close to the existing full-flow filter as possible.
  2. Select an area where the filtration system will not be damaged by road debris or off-road travel, and make sure the mounting structure is adequate to carry the weight of the filtration system.
  3. Find a location that physically has enough space for your system, as well as enough space where a filter can be installed.

    Bypass Filter Sizes
      EABP120 EABP110 EABP100 EABP90
    Size & Additional Capacity 6" - 1 Quart 7.5" - 1.5 Quarts 10.5" - 2 Quarts 12.1" - 4 Quarts

    When determining which filter to purchase, choose the largest size that will fit in your application.
    Note the EaBP120 only fits the FMK30

  4. Try to mount the system as close to vertical as possible.

    Mounting Angle Diagram B
      Acceptable Good Preferred Acceptable Good
    Angle 180°-160° 160°-130° 130°-50° 50°-20° 20°-0°

    (Recommendations are the same right to left and front to back) Mounting angle above horizontal is not recommended.

If your equipment uses this AMSOIL Filter This is the thread used on that equipment Use this adapter
EAO11 M22 x 1.5 BK299
EAO15 3/4 - 16 UNF BK295
EAO17 M22 x 1.5 BK299
EAO23 M18 x 1.5 BK297
EAO24 13/16 – 16 UNS BK302
EAO26 3/4 – 16 UNF BK295
EAO34 3/4 – 16 UNS BK295
EAO38 3/4 – 16 UNS BK295
EAO42 3/4 – 16 UNF BK295
EAO52 13/16 – 16 UNS BK302
EAO59 13/16 – 16 UNS BK302
EAO64 13/16 – 16 UNS BK296
EAO98 1 – 16 UNF BK300
EAO99 1 1/2 – 16 UN BK301
EA15K09 3/4 – 16 UNS BK295
EA15K12 M20 x 1.5 BK298
EA15K13 M20 x 1.5 BK298
EA15K13 M20 x 1.5 BK298
EA15K29 M18 x 1.5 BK297
EA15K32 13/16 – 16 UNS BK296
EA15K50 M22 x 1.5 BK299
EA15K51 3/4 – 16 UNS BK295
EA15K51 3/4 – 16 UNS BK295

If you do not know which AMSOIL Ea Oil Filter you are using, or if you are not currently using an AMSOIL Ea Oil Filter, consult the AMSOIL product guide to see all AMSOIL products available for your vehicle. You will find the filter that fits your application and then you can use the above chart to find your adapter.

All AMSOIL Ea Bypass Filters are 98.7 percent efficient at 2 microns.


Filter Height Diameter
EaBP90 5.78 4.25
EaBP100 7.25 4.25
EaBP110 10.35 4.25
EaBP120 12.1 5.35

The amount of hose provided in the system is generally more than enough for both a feed and return line for most applications. Wherever you decide to mount your Bypass Filter System, try to mount it as close to the engine as possible.

A properly installed AMSOIL Bypass System will not void your vehicle’s warranty. According to the Magnuson-Moss Warranty Act, to affect vehicle warranty an aftermarket part must be directly responsible for the failure.


  1. The Bypass System and filter(s) must be returned.
  2. If there is engine damage and the vehicle is under warranty, file a claim with the original equipment manufacturer (OEM) and notify AMSOIL at 715-399-8324 immediately. In the alternative, you may mail a claim notice, along with the OEM denial, to AMSOIL INC., ATTN:Technical Services, 1 AMSOIL Center, Superior, WI 54880, postmarked within 30 days of failure or alleged defect.
  3. Keep the filter(s) and failed parts for inspection by AMSOIL unless given to the OEM. You must allow the AMSOIL Technical Services Department to examine the Bypass System and filters and, if necessary, the engine or equipment to determine the extent of damage and whether it was caused by a defective Bypass System.

AMSOIL Ea Bypass Filters are designed to remove fine particles; they are not meant to extend oil change intervals beyond original recommendations. However, when fine particles are filtered out of the motor oil, it may be possible to attain longer drain intervals. This should be determined by used oil analysis. In addition, the use of an AMSOIL Bypass System may allow for the use of larger oil filters, which can increase filtering capacity.

If your diesel engine is equipped with exhaust gas recirculation (EGR), the soot in your exhaust is reintroduced into the engine’s intake and soot particles are constantly being put back into your combustion chamber and making their way into your oil. The average full-flow oil filter can efficiently remove wear particles 20 microns in size and larger, and while an AMSOIL Bypass Filter can efficiently remove particles down to 2 microns, it cannot capture all the soot particles smaller than 2 microns. These small soot particles have a coloring effect that can turn your oil dark. The good news is AMSOIL synthetic diesel oils have high dispersant additives that effectively keep these small soot contaminants in suspension, preventing them from agglomerating and forming larger, wear-causing contaminants.