Cummins QSL 8.9L, ISC SCR Filter 2011-2017: OEM 5418326

Steady SCR System Operation for Cummins QSL 8.9L & ISC Engines (2011–2017)

What is it?
The Cummins QSL 8.9L / ISC SCR Filter, listed as OEM 5418326, is an aftertreatment filter used in SCR-equipped Cummins engines from 2011 through 2017. Positioned in the exhaust stream before the SCR catalyst, this filter helps regulate and condition exhaust flow so the system can properly carry out NOx reduction when DEF is applied downstream.

Why choose this SCR Filter?
SCR systems depend on clean, balanced exhaust movement to operate consistently. This filter is built to match Cummins design requirements for QSL 8.9L and ISC platforms, helping ensure correct fitment and dependable interaction with DEF dosing components and sensor feedback. When an SCR filter becomes restricted or deteriorates due to soot and exhaust deposits, the system may respond unpredictably—leading to emissions warnings, irregular NOx conversion, or changes in exhaust restriction. Choosing the correct OEM-specified filter supports stable system behavior and more consistent emissions handling.

Key Benefits
✅ Designed specifically for Cummins QSL 8.9L & ISC SCR systems (2011–2017)
✅ Helps maintain balanced exhaust conditioning ahead of SCR treatment
✅ Supports smoother coordination with DEF dosing and emissions sensors
✅ Direct replacement fit—no modifications needed
✅ Built for heavy-duty exhaust heat and long service cycles

Applications
This SCR filter is commonly used in medium- and heavy-duty trucks and equipment powered by Cummins QSL 8.9L or ISC engines from 2011 to 2017. Typical applications include delivery fleets, vocational trucks, regional transport units, and equipment platforms where emissions compliance and stable aftertreatment operation are essential.

Installation Notes
Allow the exhaust system to cool fully before beginning service. Remove the existing SCR filter and inspect surrounding clamps, sensor connections, DEF-related components, and mounting hardware for buildup or wear. Install the replacement filter using appropriate gaskets and clamps to ensure a secure seal. After installation, clear fault codes and confirm proper SCR behavior through diagnostic verification.

Final Thoughts
If your Cummins QSL 8.9L or ISC-powered vehicle is showing emissions alerts or inconsistent SCR operation, replacing the SCR filter with the correct OEM unit can help restore more predictable exhaust conditioning. The Cummins SCR Filter (OEM 5418326) supports stable NOx treatment and helps maintain consistent aftertreatment function across daily work cycles.