Cummins X15 DOC Filter 2018-2024: OEM 4395039

Clean Exhaust Support 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 helps convert hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases. This conversion supports the aftertreatment system in maintaining consistent and dependable operation.

Why choose this DOC Filter?
Engineered to meet original equipment specifications for the Cummins X15 platform, this DOC filter offers precise fitment 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, and emissions-related fault codes. Installing the correct DOC filter helps preserve steady exhaust flow and reliable system behavior.

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
Ideal for heavy-duty trucks, commercial vehicles, and other equipment powered by Cummins X15 engines from model years 2018 through 2024. This DOC filter is especially useful in fleet, vocational, and long-haul applications where emissions compliance and reliable aftertreatment performance are essential.

Installation Notes
Before servicing, ensure the exhaust and aftertreatment system has fully cooled. 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 fresh clamps, gaskets, and seals. After installation, clear any stored emissions-system fault codes and verify proper exhaust system behavior through diagnostic checks.

Final Thoughts
If your X15-equipped vehicle is experiencing increased exhaust restriction, emissions warnings, or irregular aftertreatment performance, replacing the DOC filter with the proper OEM-specified unit is a practical step toward restoring clean, dependable exhaust flow. This component plays a key role in maintaining the integrity of the emissions-control system and supporting reliable equipment operation.