Skip to Main Content
Shop by Vehicle
Open full size product Heavy-Duty Bypass System
Roll over image to zoom in
Roll over image to zoom in

AMSOIL Heavy-Duty Bypass System

Product code : BMK30-EA

  • 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

AMSOIL Heavy-Duty Bypass System



Maximum filtration performance for virtually all heavy-duty diesel and gasoline applications, including Class 6, 7 and 8 heavy-duty trucks, off-road equipment, buses, generators, marine engines, logging and agricultural equipment.

See the product data sheet for full details.

Maximum Filtration Protection

  • Efficient removal of small particles and soot that full-flow oil filters can’t capture alone
  • Removal of particles 2 microns and larger
  • Improved oil cooling
  • Reduces maintenance costs

Offer Extended Service Life

  • Helps extend engine life
  • Increased fluid system capacity
  • Increased filtration capacity and life
  • Helps extend oil drain intervals

See the product data sheet for full details.

BMK30 Installation and Servicing Instructions

Note: For fitting suggestions and fitting locations, please reference the BMK30 Fittings List

AMSOIL Heavy-Duty Bypass System

Data Bulletin

Warranty



AMSOIL Heavy-Duty Bypass System

  • 5 star rating
    No Oil Filter is better—none!
    By  STURE,  a  Verified Buyer  from  Elk River, MN  on  November 12, 2024
    No Oil Filter is better—none! I have used this product since May 2020. My diesel engine purrs like a content kitten, and I have gone 15K miles between oil changes.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Worth Every Penny
    By  BEAU,  a  Verified Buyer  from  Colorado  on  November 11, 2024
    I installed a bypass filter on my 150 HP generator that I use for running a pivot sprinkler and water pump, historically I would have to change the oil (AMSOIL 15W-40) every 250 hours I had run on it; per the oil analysis (Blackstone). for the second year in a row where I exceeded 600 hours on the oil and the analysis has recommended I go another 70-100 hours before checking it again or changing the oil because it looked so good. This filter does only have a 1 year warranty, so I will be changing it at least once a year but it has paid for itself in the first two years and then some.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Easy install
    By  BRIAN,  a  Verified Buyer  from  Indiana  on  November 07, 2024
    Simple to install on a 1990 855 Big Cam Cummins. Seems to be doing a good job at keeping the oil clean. 1500 miles into the oil change and the oil is still gold colored.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Bypass Filter kit
    By  JERRY,  a  Verified Buyer  on  October 30, 2024
    I am very pleased that I bought the AMSOIL oil bypass kit! I mounted it up on top of my engine to have easy access to it and it is a breeze when it's time to change it! I recommend it to anyone to get it and get more protection for your engine!
    Was this review helpful?
  • 5 star rating
    Worked sense 2000
    By  PERRY,  a  Verified Buyer  from  Sevierville, TN  on  October 23, 2024
    I have used the dual filter system on 3 Tow Vehicles since 2000, and have never had an oil problem. One of the vehicles now has over 200,000 miles on it now, and still going strong.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great bypass filter
    By  NORM,  a  Verified Buyer  on  June 09, 2024
    Item works great as is… but I have a large magnet on the bottom for more protection, maybe amsoil can incorporate in there filters
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Amsiol is #1 for me
    By  Martin,  a  Verified Buyer  from  Harrod ohio   on  May 18, 2024
    Been using Amsoil Products for 30+ years
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Made a believer out of me!
    By  LARRY,  a  Verified Buyer  from  Indiana  on  May 14, 2024
    My 2003 Dixie Chopper lawn mower came with a BP90 Amsoil bypass filter. The mower is 21 years old and runs as good as when it was new. I feel like the bypass filter has saved me a lot of money in not having to by a new motor or mower because of a worn motor!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Three Tow Trucks Loves These Products
    By  PERRY,  a  Verified Buyer  from  Gatlinburg, TN  on  May 08, 2024
    I have had the Dual Filter system on 3 GMC Pickups that towed my 10,000 pound Airstream all over all the Lower 48, most of the Canadian Provences, two summers in Alaska, and two summers in Newfoundland. For several years I always sent oil off for testing when I changed the oil at the end of the year, and never got a report stating I needed to change the oil. I no longer send oil off for testing, and have never had a problem. I Chang the full floe filter twice per year, and the Bypass filter once per year, and always use the top quality Amsoil at the time. My last two trucks have been DuraMax Diesels, one of them now owned by a friend now has over 200,000 miles on it, and still pulls his travel trailer all over. It still follows my oil change program, I supply the oil and filters for the truck.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Cummins 6.7 bypass filter
    By  RICHARD,  a  Verified Buyer  from  Texas  on  April 09, 2024
    What a difference this has made in the oil quality. 2 microns vs. 20 microns of filtration makes a huge difference. With the cost of oil and filters today this will allow me to extend my change intervals. I should have the return on the investment in 2 oil changes, not to mention the overall protection of my engine.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?