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Cummins ISB 6.7L, B6.7 DOC Filter 2021-2026: OEM 5418512

CUMMINS ISB 6.7L, B6.7 DOC FILTER 2021-2026: OEM 5418512

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

CORE CHARGE:

$1,000.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER5418512
PART TYPEDOC Filter
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISB 6.7L, B6.7
YEAR2021-2026
PART NUMBER5418512RM-DOC
APPLICATION NOTESStage 5
ADDITIONAL NOTESInlet Catalyst

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx DOC Filter, Tamerx part number 5418512RM-DOC ( OEM Part Number 5418512 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins ISB 6.7L, B6.7, production years 2021-2026, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: Inlet Catalyst

OEM NUMBERS

Primary OEM5418512
Additional OEM5418512

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490554221
WEIGHT52.00 LBS

SHIPPING OPTIONS

Ship Weight : 52.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Built for today’s advanced aftertreatment systems, the Cummins ISB 6.7L, B6.7 DOC Filter 2021–2026 (OEM 5418512) helps manage exhaust gases at the oxidation stage. Designed for Cummins ISB 6.7L and B6.7 engines, this component supports proper exhaust flow before it moves through the rest of the system. Manufactured to meet OEM specifications, it ensures accurate fitment and dependable compatibility. Using the correct DOC filter helps maintain consistent emissions system operation and reliable performance.

FITMENT CHART

YEARMAKEENGINE(S)
2021Cummins ISB 6.7L B6.7
2022Cummins ISB 6.7L B6.7
2023Cummins ISB 6.7L B6.7
2024Cummins ISB 6.7L B6.7
2025Cummins ISB 6.7L B6.7
2026Cummins ISB 6.7L B6.7

PEOPLE ALSO ASKS | BLOG(S)

Every efficient diesel aftertreatment system starts with a strong first stage—and that’s where the DOC (Diesel Oxidation Catalyst) filter comes in. Installed at the front of the exhaust system, this component immediately begins breaking down harmful gases before they reach the DPF and SCR. In Cummins ISB 6.7L and B6.7 engines, the DOC filter plays a key role in setting up the entire emissions process for success.

  • First Line of Defense Against Harmful Emissions
    The DOC is the initial stage in the aftertreatment system, treating raw exhaust gases right after they leave the engine to begin the cleanup process.
  • Breaks Down Carbon Monoxide and Hydrocarbons
    Through oxidation, the DOC converts harmful gases into carbon dioxide and water vapor, helping reduce toxic emissions early in the exhaust cycle.
  • Enhances Performance of DPF and SCR Systems
    By conditioning exhaust gases and increasing temperature, the DOC helps downstream components like the DPF and SCR operate more effectively.
  • Designed for Cummins ISB 6.7L and B6.7 Engines (2021–2026)
    Built to OEM 5418512 specifications, this DOC filter is engineered for proper fitment and seamless integration with the factory aftertreatment setup.
  • Durable Flow-Through Catalyst Construction
    Featuring a honeycomb-style internal structure, the DOC maximizes surface area for chemical reactions while allowing continuous exhaust flow under heavy-duty conditions.

The DOC filter is more than just a component—it’s the starting point of effective emissions control. For Cummins ISB 6.7L and B6.7 engines, having a reliable DOC in place helps ensure cleaner exhaust, supports downstream systems, and keeps the entire aftertreatment process running smoothly day after day.

The Diesel Oxidation Catalyst (DOC) is a key part of the diesel aftertreatment system, responsible for reducing harmful exhaust gases and supporting proper operation of downstream components. When the DOC begins to fail or becomes contaminated, it can affect overall exhaust efficiency and lead to noticeable issues. Recognizing these symptoms early can help prevent more serious system problems.

  • An illuminated check engine light is one of the most common signs, often with codes related to catalyst efficiency or emissions performance.
  • Increased exhaust smoke or a stronger exhaust odor may occur if the DOC is no longer effectively oxidizing hydrocarbons.
  • Reduced fuel efficiency can develop as the engine compensates for improper exhaust treatment.
  • Frequent or unsuccessful Diesel Particulate Filter (DPF) regeneration cycles may happen due to poor DOC performance.
  • Excessive soot buildup in the exhaust system can indicate that gases are not being properly processed.
  • Higher exhaust temperatures or irregular temperature readings may signal a problem within the DOC.
  • Failed emissions testing may occur due to increased levels of untreated exhaust gases.

Identifying these symptoms early allows for proper diagnosis and repair before further damage occurs. Maintaining the engine and aftertreatment system helps ensure the DOC continues to function effectively and supports reliable emissions control.

 

It prepares exhaust gases for further treatment by other emissions components.

Yes, low temperatures can limit the effectiveness of the catalytic reactions.

Buildup of contaminants or debris can restrict flow and reduce efficiency.

It does not require routine service, but it should be checked for buildup or damage.

Cummins DOC Filters

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