Cummins X15 DOC Filter 2018-2024: OEM 4395039

Dependable Exhaust Flow for Cummins X15 Engines (2018–2024)

What is it?
The Diesel Oxidation Catalyst (DOC) filter for the Cummins X15 engine (model years 2018–2024), OEM reference 4395039, is an emissions-control component that converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases. This process supports the aftertreatment system in maintaining consistent and reliable operation.

Why choose this DOC Filter?
Designed to meet original equipment specifications for the Cummins X15 platform, this DOC filter delivers direct compatibility and dependable integration with the exhaust and aftertreatment system. A mismatched, worn, or blocked filter can lead to increased exhaust restriction, more frequent regeneration cycles, or emissions-related fault codes. Installing the correct DOC filter helps sustain steady exhaust flow and dependable system performance.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports proper function of downstream aftertreatment components
✅ Helps maintain steady exhaust flow and reduce restriction
✅ Direct-fit design — no modifications required
✅ Built for heavy-duty, high-temperature operating environments

Applications
This DOC filter is ideal for heavy-duty trucks and commercial vehicles powered by Cummins X15 engines from model years 2018 through 2024. It is especially suited for fleets, on-road projects, and vocational applications where emissions compliance and reliable aftertreatment performance are essential.

Installation Notes
Ensure the exhaust and aftertreatment system has fully cooled before beginning service. Remove the existing DOC filter and inspect adjacent exhaust piping, sensors, and mounting hardware for soot buildup, cracks, or signs of wear. Install the replacement using new clamps, gaskets, and seals. After installation, clear any stored emissions-system fault codes and verify proper exhaust system behavior using diagnostic checks.

Final Thoughts
If your X15-equipped vehicle is experiencing elevated exhaust restriction, emissions warnings, or inconsistent aftertreatment operation, replacing the DOC filter with the correct OEM-specified unit is a practical way to restore clean, dependable exhaust flow. This component plays a crucial role in preserving the integrity of the emissions-control system and supporting reliable equipment performance.