Cummins QSB4.5, 3.8 SCR Filter 2018-2024: OEM 5510794

Optimized SCR Conditioning for Cummins QSB4.5 & 3.8 Engines (2018–2024)

What is it?
The Cummins QSB4.5, 3.8 SCR Filter (2018–2024), specified by OEM part number 5510794, is an emissions aftertreatment component designed for Cummins QSB4.5 and 3.8-liter diesel engines built between 2018 and 2024. Installed upstream of the Selective Catalytic Reduction (SCR) catalyst, this filter helps prepare exhaust gases so they’re better suited for NOx conversion when interacting with Diesel Exhaust Fluid (DEF).

Why choose this SCR Filter?
This SCR filter is engineered to Cummins’ original standards for the QSB4.5 and 3.8 platforms, ensuring precise fitment and smooth integration with DEF dosing hardware, emissions sensors, and aftertreatment controls. Over time, soot, ash, and other exhaust deposits can reduce a filter’s effectiveness, which can make gas conditioning less consistent and potentially trigger system warnings. Installing the correct OEM-specified filter helps sustain coordinated exhaust conditioning and supports dependable emissions behavior.

Key Benefits
✅ Designed for Cummins QSB4.5 and 3.8 aftertreatment systems (2018–2024)
✅ Helps condition exhaust gases for effective NOx reduction
✅ Promotes stable interaction with emissions sensors and DEF dosing systems
✅ Direct-fit replacement — no modifications required
✅ Built for heavy-duty use and extended service environments

Applications
This SCR filter is suitable for medium- and heavy-duty trucks and commercial vehicles powered by Cummins QSB4.5 or 3.8 engines manufactured between 2018 and 2024. It’s commonly used in delivery fleets, vocational rigs, regional transport trucks, and other work platforms where regulated emissions performance and reliable aftertreatment behavior are essential.

Installation Notes
Before beginning service, allow the exhaust and aftertreatment system to fully cool to prevent injury. Remove the existing SCR filter and inspect surrounding DEF lines, sensor connections, and mounting points for signs of soot buildup, wear, or damage. Install the replacement filter with proper gaskets and clamps to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct emissions system behavior using diagnostic tools.

Final Thoughts
If your Cummins-equipped vehicle is experiencing NOx-related warnings, uneven emissions readings, or inconsistent exhaust behavior, replacing the SCR filter with the correct OEM-specified unit can help restore smoother exhaust conditioning and more predictable emissions system responses. The Cummins QSB4.5, 3.8 SCR Filter (OEM 5510794) plays a key role in managing regulated exhaust chemistry and supporting dependable engine operation across a variety of duty cycles.