Cummins X15 DOC Filter 2018-2024: OEM 4395039

Trusted Exhaust Treatment 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 a key emissions-control component. It converts hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the aftertreatment system in maintaining reliable and consistent operation.

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

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports the 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, vocational vehicles and equipment powered by Cummins X15 engines from model years 2018 through 2024. This DOC filter is particularly useful in fleet, on-road, and commercial 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 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 via diagnostic checks.

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