Cummins B6.7 DOC Filter 2018-2021: OEM 5418478

Emission Control You Can Count On: Cummins B6.7 DOC Filter (2018–2021, OEM 5418478)

What is it?
The Cummins B6.7 DOC Filter (2018–2021, OEM 5418478) is a Diesel Oxidation Catalyst (DOC) designed for Cummins B6.7 engine platforms manufactured between 2018 and 2021. Its primary role is to oxidize hydrocarbons (HC) and carbon monoxide (CO) in the exhaust system, converting them into less harmful compounds before release. This process ensures cleaner emissions and enhances the performance of downstream components like the DPF and SCR.

Why Choose the Cummins B6.7 DOC Filter (OEM 5418478)?
This DOC is engineered to match Cummins’ original specifications—sensor port placement, exhaust flow path, and mounting geometry align with factory design. Using a filter that adheres to OEM standards ensures precise installation, maintains balanced exhaust flow, and supports stable emissions performance over the system’s service life.

Key Benefits
✅ OEM-Accurate Fitment: Designed to align perfectly with factory mounting flanges and sensor ports.
✅ Durable Construction: Built to handle extreme exhaust heat, vibration, and continuous-duty operation.
✅ Effective Emission Control: Promotes oxidation of HC and CO, helping the engine meet emissions regulations.
✅ Operational Reliability: Reduces fault codes, regeneration irregularities, and downtime.
✅ System Protection: Cleaner exhaust extends the life of sensors, piping, and downstream filters.

Applications
The Cummins B6.7 DOC Filter (2018–2021, OEM 5418478) is ideal for medium- and heavy-duty trucks, commercial fleets, and industrial vehicles equipped with the B6.7 engine. It’s particularly suited for regional, highway, and vocational operations where emission reliability and long-term durability are vital.

Installation Notes
While this DOC is designed for direct replacement, professional installation is recommended. Before installation, confirm engine compatibility and inspect the exhaust system for leaks or damage. Remove the existing unit carefully, cleaning all mating surfaces and replacing any worn gaskets or clamps. Install the new DOC, ensuring secure alignment of bolts, sensors, and fittings. Once installed, reconnect the sensors, clear any diagnostic fault codes, and monitor exhaust temperatures and pressure to confirm proper function. Ensuring a tight, leak-free fit will help maintain optimal performance and extend component life.

Final Thoughts
A dependable DOC is key to a clean and efficient aftertreatment system. The Cummins B6.7 DOC Filter (2018–2021, OEM 5418478) provides a factory-level solution designed for precision, durability, and consistent emissions control—helping your Cummins engine stay compliant and dependable mile after mile.