Cummins ISL, QSL SCR Filter 2018-2024: OEM 5418435

Engine-Matched Exhaust Conditioning for Cummins ISL & QSL Engines (2018–2024)

What is it?
The Cummins ISL, QSL SCR Filter (2018–2024), specified by OEM part number 5418435, is a key emissions aftertreatment component for Cummins ISL and QSL diesel engines produced from 2018 through 2024. Installed as part of the Selective Catalytic Reduction (SCR) system, this filter works with Diesel Exhaust Fluid (DEF) to help prepare exhaust gases for effective nitrogen oxide (NOx) conversion before they enter the SCR catalyst.

Why choose this SCR Filter?
This SCR filter is engineered to meet Cummins’ original specifications for both ISL and QSL platforms, ensuring a direct fit and reliable integration with DEF dosing components, emissions sensors, and downstream treatment hardware. When the SCR filter becomes clogged or deteriorated, exhaust flow and NOx conditioning can become inconsistent, potentially triggering emissions system alerts or uneven aftertreatment behavior. Using the correct OEM-specified filter helps maintain consistent exhaust conditioning and more predictable emissions system performance.

Key Benefits
✅ Designed specifically for Cummins ISL and QSL aftertreatment systems (2018–2024)
✅ Helps condition exhaust gases ahead of SCR conversion
✅ Supports smoother interaction with DEF dosing hardware and emissions sensors
✅ Direct replacement — no modifications required
✅ Built for demanding exhaust environments and heavy-duty use

Applications
This SCR filter is ideal for medium- and heavy-duty vehicles powered by Cummins ISL or QSL engines built between 2018 and 2024. Typical applications include delivery trucks, vocational fleets, regional haulers, construction units, and other commercial platforms where reliable emissions conditioning and compliance are part of everyday operation.

Installation Notes
Before servicing, ensure the exhaust and aftertreatment system has fully cooled to avoid burns or damage. Remove the existing SCR filter and inspect neighboring DEF lines, sensors, and mounting hardware for soot buildup or wear. Install the new filter using proper seals and clamps to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct behavior of the emissions system with appropriate diagnostics.

Final Thoughts
If your Cummins ISL- or QSL-equipped vehicle is experiencing uneven NOx behavior, emissions warnings, or irregular aftertreatment responses, replacing the SCR filter with the correct OEM-specified unit can help restore balanced exhaust conditioning and steadier system performance. The Cummins ISL, QSL SCR Filter (OEM 5418435) plays a central role in managing regulated exhaust chemistry and supporting dependable engine operation across varied duty cycles.