Product Overview
Aftermarket DOC for Cummins & PACCAR 4965340 / Q621548 / 5287478
Interchangeable Component Configurations: 4965340 | Q621548 | 5287478
Cummins & PACCAR OEM Cross Reference
Verify Your Unit: This direct-fit replacement diesel oxidation catalyst replaces exhaust components stamped with housing numbers, casting codes, or tags matching any of the interchangeable manufacturing references listed below:
| Manufacture | Cross Reference Part Numbers |
|---|---|
| Cummins OEM | 4965340, 4965340NX, 5287478, 5287478NX, 5287478RX, A035H168 |
| PACCAR OEM | Q621548 |
| Skyline | BG0411 |
| DuraFit | C20-0155 |
| Dinex | 58200 |
| FSS Emission Products | BG0411-FSS |
Restore commercial fleet emissions performance with this premium aftermarket replacement element for Cummins & PACCAR OEM DOC parts 4965340, Q621548, and 5287478. This brand-new Diesel Oxidation Catalyst (DOC) serves as a standalone direct replacement for your commercial fleet's factory setup. Engineered specifically for heavy-duty systems running Cummins ISB and PACCAR PX6 engine platforms, it requires no exhaust system modifications for installation, carries zero core charge, and ships free within the continental United States.
Choose Your Kit Configuration
Select the setup from the product options above that best fits your shop's needs:
- Full Kit (Best Value): Includes (1) Brand-New Unit, (2) Original Equipment Quality 2871451 Aftermarket Exhaust Gaskets, 2866636 Aftermarket Exhaust Gaskets, 2871861 Heavy-Duty Clamps, and 2880482 Heavy-Duty Clamps.
- DOC Only: Includes the replacement component only. Installation gaskets and clamps are not included.
Technical Specifications
| Measurement Parameter | Specification Value |
|---|---|
| Material Base Construction | Stainless Steel |
| Net Assembly Weight | 29.77 lbs (13.52 kg) |
| Overall Length | 13.58 inches (344.93 mm) |
| Outer Body Diameter | 10.61 inches (269.50 mm) |
| Component Dimensions (W x H) | 10.61 x 10.61 inches (269.50 x 269.50 mm) |
| Global Article Number (EAN) | 5700760348965 |
| Exhaust Emissions Norm | EPA07 Compliant |
Warranty
Backed by a three-year unlimited mileage warranty on all aftermarket DPF and DOCs.
Key Features & Specifications for Skyline DOC Filters
- Proudly Built in the USA: Designed, engineered, and manufactured in America.
- No Core Charge: Brand-new aftermarket replacement element; eliminates core return freight costs and paperwork delays.
- Technical Dimensions: Engineered with OEM-matching physical sizing, pre-machined sensor bosses, and rigid factory-spec hanger brackets for direct exhaust installation with zero modifications required.
- Substrate: Advanced flow-through catalyst core features optimized precious metal washcoat loading to maintain optimal exhaust temperatures, regulate low backpressure limits, and sustain downstream emissions control.
- EPA Compliant: Meets federal emissions standards for legal installation.
- Free Shipping: Free ground shipping within the continental United States. Orders placed before 2:00 PM Eastern ship out the same business day.
Heavy-Duty Vehicle Fitment Guide
Direct alternative solution for commercial trucks configured with horizontal chassis exhaust layouts. Optimized for:
- Engine Platforms: Highly optimized for Cummins ISB and PACCAR PX6 powertrain architectures approximate model years 2007-2009.
- Chassis Fitments: Extensively deployed across medium-duty regional transport setups, school buses, vocational trucks, delivery applications, and fleet chassis vehicles matching engine requirements.
Signs Your Diesel Oxidation Catalyst (DOC) Needs Replacement
- Frequent, unprompted, or incomplete DPF regeneration cycles linked directly to upstream catalyst efficiency degradation matching part numbers 4965340 / Q621548
- Excessive particulate soot face-plugging or heavy face mask scaling across the internal catalyst face assembly
- Active dashboard diagnostic trouble codes (DTCs) pointing directly to poor catalyst conversion efficiencies or thermal response delays
- Unexplained commercial engine backpressure spikes or noticeable horsepower deterioration under loaded transport pulls
*Note: Always verify exact vehicle compatibility using your vehicle's VIN number, emissions family descriptor tag, or the original stamped part number on your filter unit casing before placing an order.
Looking for a reliable replacement filter fast?
We ship from several warehouses throughout the USA and Canada to get your DPF or DOC to you as fast as possible. Contact us today if you need cross-reference validation.
Frequently Asked Questions
Is there a core charge for this aftermarket emissions unit?
No, this is a 100% brand-new aftermarket component. Unlike remanufactured factory units, there is absolutely zero core charge, zero tracking paperwork required, and no need to spend money shipping your old, dirty unit back to us.
Does this replacement unit come with the necessary clamps and gaskets?
When you select the "Full Kit" option from the dropdown on this page, all exact-fit installation gaskets and heavy-duty clamps required for installation are bundled and shipped directly with the assembly. Selecting the component-only option provides the bare unit without hardware.
How fast will my order ship out?
Orders confirmed before 2:00 PM Eastern standard time ship out from our closest regional fulfillment hub on the exact same business day. Free standard ground shipping is included to the continental United States, and expedited overnight air choices can be selected directly at checkout.
How do I verify this aftermarket filter matches my truck's setup?
You can verify fitment by identifying the original casting, housing, or tag stamp directly on your factory exhaust unit canister shell. If that number matches any of the cross-references listed on this page, or if your engine model and year line up with our application guide, it will bolt directly in with a perfect factory alignment.
Disclaimer: Product images for reference only. Final replacement hardware items matching OEM parameters such as gaskets, clamps, and sensor ports depend on your kit configuration. Selecting the "Full Kit" option adds the explicitly listed installation components to your shipment. Price is for one (1) DPF or DOC only.
