Updated on May 11, 2026.
Quick Answer: A 6.7 Cummins CCV reroute can help keep oil mist out of the turbo inlet, intercooler boots, and intake tract, but it is not the right choice for every truck. Street-driven trucks in emissions-inspection areas may be better served by replacing the factory CCV filter. Off-road, competition, or legally permitted applications may consider a reroute kit or catch can setup.
- Factory role: The CCV filter manages crankcase vapors and oil mist before they return toward the intake.
- Common symptoms: Oil smell, oily intake boots, “Perform Service” messages, restriction codes, or heavy crankcase vapor at the oil fill cap.
- Main options: Replace the OEM filter, run an open vent/draft tube, or use a catch can/vent tank.
- Critical warning: Do not unplug the crankcase pressure sensor, and avoid hose routing that can freeze or trap moisture.
Author: SPELAB Technical Team | Vehicle Application: 2007.5+ Dodge Ram / Ram 2500 3500 6.7L Cummins
Is your 6.7 Cummins smelling like burnt oil inside the cab? Have you noticed oily residue in the turbo inlet, intercooler boots, or intake piping? Or do you see crankcase vapor when removing the oil fill cap? These can be signs of a saturated CCV filter, excess crankcase pressure, or heavy blow-by that needs diagnosis.
Some owners try to clean the factory filter or remove the internal media, often called “gutting.” Others choose a CCV reroute kit to redirect crankcase vapor away from the turbo inlet. This guide explains when a reroute makes sense, when replacing the factory filter is safer, how open vent and catch can setups compare, and how to install a reroute kit correctly.
What Is the CCV Filter on a 6.7 Cummins?
The CCV filter, or crankcase ventilation filter, separates oil mist from crankcase vapors before those vapors are routed back toward the intake system. On a stock 6.7 Cummins, the system helps control crankcase emissions and keeps the engine operating within the factory ventilation strategy.
Over time, the filter can become saturated with oil mist and soot-contaminated residue. When restriction increases, the truck may display a service message, develop oil smell, leak oil around boots, or show symptoms that owners often confuse with turbo or intake problems.
Symptoms of a Clogged or Saturated 6.7 Cummins CCV Filter
- Burnt oil smell: Oil vapor smell may become noticeable inside or around the truck.
- Oily turbo inlet or intake boots: Oil mist can coat the intake path and soften silicone boots over time.
- “Perform Service” or restriction message: Some trucks alert the driver when the CCV filter reaches the service interval or restriction threshold.
- Oil residue around connections: Boots, clamps, and intake plumbing may collect oily film.
- Visible vapor at the oil fill cap: Some vapor can be normal, but heavy vapor may indicate excessive blow-by.
- Early filter clogging: Some owners report CCV restriction messages earlier than the factory service interval, especially with heavy idle time, towing, short trips, or higher blow-by.
For OEM-style maintenance, see our guide on how to replace the 6.7 Cummins CCV filter.
Figure 1: The factory filter housing often hides oil sludge accumulation.
Should You Replace the CCV Filter or Reroute It?
A CCV reroute is not automatically better than replacing the factory filter. The right choice depends on how the truck is used, whether emissions inspection applies, the climate, and the condition of the engine.
| Situation | Better Choice | Why |
|---|---|---|
| Street-driven truck with emissions inspections | Replace the factory CCV filter | Maintains the factory ventilation layout and avoids visual inspection concerns. |
| Off-road, competition, or legally permitted use | Consider a CCV reroute kit | Helps keep oil mist out of the turbo inlet, intercooler boots, and intake tract. |
| Owner wants less oil smell and less dripping | Catch can / vent tank | Captures oil instead of venting it directly under the truck. |
| Cold winter climate | Use caution with any open vent | Condensation can freeze inside the hose and create crankcase pressure. |
| Heavy blow-by or strong vapor from oil fill cap | Diagnose engine health first | A reroute will not repair worn rings, cylinder wear, or excessive crankcase pressure. |
OEM Filter vs Open Vent vs Catch Can
Most 6.7 Cummins owners compare three options: replacing the OEM filter, using an open breather/draft tube, or routing vapor into a catch can. Each option has trade-offs.
| Option | Best For | Pros | Cons |
|---|---|---|---|
| OEM CCV Filter Replacement | Street-driven trucks, emissions-sensitive areas, warranty-conscious owners | Factory-style maintenance, less odor, cleaner compliance path | Recurring filter cost; oil mist still returns toward the intake path |
| Open Vent / Draft Tube | Off-road or legally permitted use where simplicity matters | Simple, low maintenance, keeps oil mist out of turbo inlet | Possible oil smell, oil drips, winter freezing risk |
| Catch Can / Vent Tank | Owners who want a cleaner reroute setup | Captures oil, reduces odor and driveway drips | Must be drained; more parts and mounting planning required |
If oil smell or driveway drips are a concern, a catch can setup is usually cleaner than an open draft tube. You can compare compatible oil catch can options if you want a cleaner reroute setup.
2007.5-2024 Dodge Ram Cummins CCV Reroute Kit
This is the primary product path for 6.7 Cummins owners who want a cleaner reroute setup instead of sourcing plates, hoses, fittings, and plugs separately. Open the product page to confirm model-year fitment, included components, routing notes, and current buying options.
CCV PCV ReRoute Engine Ventilation Kit for Dodge Ram 6.7L Diesel | SPELAB
Figure 2: Catch can setups can reduce odor and oil dripping compared with an open vent.
Notes for 2019+ Ram 2500/3500 6.7 Cummins
2019+ Ram 2500/3500 trucks may have small packaging, sensor, and service-interval differences compared with earlier 6.7 Cummins trucks. Before ordering a CCV reroute kit, confirm your model year, valve cover layout, crankcase pressure sensor location, hose routing, and factory CCV service interval according to your owner’s manual or service information.
For 2019+ trucks, always confirm product page fitment before ordering, especially if your truck has a different valve cover layout, sensor position, or hose routing than earlier 6.7 Cummins models.
Parts and Tools Needed
Unlike DIY approaches that require sourcing hoses, fittings, plugs, and plates separately, a dedicated 6.7 Cummins CCV reroute kit can simplify the installation by including the billet plate, vent hose, turbo inlet plug, fittings, and mounting hardware in one package.
Basic Tools
- Socket set and ratchet
- Screwdrivers or drivers for engine cover and housing fasteners
- Pliers for hose clamps
- Clean rags
- Zip ties or clamps for hose routing
- Gloves and eye protection
Kit Components Typically Needed
- Billet CCV reroute plate
- Vent hose
- Turbo inlet plug or cap
- Gasket or sealing hardware
- Fittings, clamps, and mounting hardware
Step-by-Step: How to Reroute the CCV Filter on a 6.7 Cummins
Step 1: Access the Factory CCV Filter Housing
Remove the decorative engine cover and clear access to the CCV filter housing. Inspect the surrounding area for oil residue, cracked hoses, loose clamps, or signs of excessive crankcase pressure.
Step 2: Remove the Factory CCV Filter Housing
Loosen the housing bolts and carefully remove the CCV filter assembly. Remove the old filter element and wipe away loose oil residue. Avoid dropping debris into the engine or open passages.
Step 3: Install the Billet Reroute Plate
Install the billet aluminum reroute plate from the kit onto the factory mounting location. Make sure the gasket is seated correctly to prevent leaks. Tighten the bolts evenly and securely according to the kit instructions.
Step 4: Cap the Turbo Inlet
Locate the hose running from the old CCV box to the turbo intake. Disconnect it and install the provided billet plug or cap into the turbo inlet boot. This seals the intake side so oil mist is no longer routed into the turbo inlet.
Step 5: Route the Vent Hose
Connect the new vent hose to the reroute plate. Route the hose downward along the driver-side frame area or toward your catch can, depending on your setup. Secure the hose away from moving parts, exhaust heat, sharp edges, and steering components.
Figure 3: Route the hose with a continuous downward slope and no low spots where oil or moisture can collect.
Step 6: Recheck the Sensor, Hose Slope, and Leaks
After installation, verify that the crankcase pressure sensor remains electrically connected, the turbo inlet is sealed, the vent hose has no dips or kinks, and there are no oil leaks around the plate or fittings.
Recommended Fitment Check: SPELAB 6.7 Cummins CCV Reroute Kit
For compatible Ram 2500/3500 6.7L Cummins trucks, this kit is designed to provide the billet plate, hose, fittings, and turbo inlet plug needed for a cleaner reroute installation. Always verify your truck’s model year and engine layout before ordering.
Check Product FitmentCritical Tech Tips
The sensor must remain electrically connected. If it is unplugged, the ECM may trigger a Check Engine Light or crankcase pressure-related fault. Many DIY installation problems come from treating the sensor like a part that should be removed, when it actually needs to stay connected.
Winter Warning: Avoid Frozen Vent Hoses
If you live in a freezing climate, hose routing is critical. Moisture from crankcase vapors can condense and freeze inside the vent hose. If the hose freezes shut, crankcase pressure can build rapidly and may push oil past seals or cause major leaks.
- Check for low spots where oil or condensation can collect.
- Make sure the hose has a continuous downward slope.
- Inspect the hose outlet monthly in freezing weather.
- Keep the hose outlet away from slush, road ice, and debris.
- Consider insulated sleeve or a catch can setup in extreme cold climates.
- Drain and inspect the catch can more often during short-trip winter driving.
Common Mistakes to Avoid
| Mistake | Why It Matters | Better Approach |
|---|---|---|
| Unplugging the crankcase pressure sensor | Can trigger CEL or crankcase pressure-related codes. | Keep the sensor electrically connected. |
| Routing the hose with low spots | Oil and moisture can pool, freeze, or restrict flow. | Use a continuous downward slope. |
| Venting near the cab or HVAC intake | Can increase oil smell inside the cab. | Route the hose farther back or use a catch can. |
| Ignoring heavy blow-by | A reroute does not repair engine wear. | Diagnose compression, rings, or crankcase pressure if vapor is excessive. |
| Skipping post-install inspection | Leaks, loose fittings, or poor routing can create problems later. | Recheck after the first drive and again after several heat cycles. |
Conclusion
A 6.7 Cummins CCV reroute can be a practical solution for off-road, competition, or legally permitted applications where the goal is to keep oil mist out of the turbo inlet, intercooler boots, and intake tract. But it is not a universal fix for every truck.
If your truck is street-driven, emissions-inspected, under warranty, or used in a cold winter climate, replacing the factory CCV filter or using a properly maintained catch can setup may be the better choice. If you have heavy crankcase vapor at the oil fill cap, diagnose engine health before modifying the CCV system.
For a cleaner, easier installation on compatible trucks, the pre-designed SPELAB kit helps simplify the reroute process with matched components and a direct-fit layout.
Frequently Asked Questions
Q: What are the primary benefits of performing a CCV reroute on a 6.7 Cummins?
A: The main benefit is helping prevent oil mist and sludge from entering the turbocharger, intercooler pipes, and intake manifold. Rerouting can also reduce future intake oil contamination and eliminate the recurring cost of factory CCV filter replacement in off-road or legally permitted applications.
Q: Is a CCV reroute the same as replacing the factory CCV filter?
A: No. Replacing the filter keeps the factory closed ventilation layout. A reroute changes where crankcase vapors go and is generally intended for off-road, competition, or legally permitted applications.
Q: Will installing a CCV reroute kit trigger a Check Engine Light?
A: Generally, no, if the kit is installed correctly and the crankcase pressure sensor remains electrically connected. If you unplug the sensor entirely, the ECM may detect a fault and trigger a code.
Q: Should I choose an open breather kit or a catch can setup?
A: An open breather or draft tube is simpler and low maintenance, but it may create oil smell or small drips. A catch can traps oil vapor and helps keep the setup cleaner, but it must be drained regularly.
Q: What size catch can do I need for a 6.7 Cummins CCV reroute?
A: Many DIY owners discuss vent tanks in the 7–9 oz to 1 quart range. A smaller can may fit more easily, while a larger can gives more buffer between drain intervals. Actual needs depend on blow-by level, towing load, idle time, climate, and drain frequency.
Q: Can a CCV reroute fix excessive blow-by?
A: No. A reroute can redirect crankcase vapors, but it does not repair worn piston rings, cylinder wear, or excessive crankcase pressure. Heavy blow-by should be diagnosed before modifying the system.
Q: Are there any risks to running a CCV reroute in cold winter climates?
A: Yes. Moisture from crankcase vapors can condense and freeze inside the vent hose. If the hose becomes blocked by ice, crankcase pressure can build and may push oil past seals. Cold-climate routing is critical.
Q: What happens if the CCV vent hose freezes?
A: If the vent hose freezes shut, crankcase pressure can build rapidly. This can cause oil leaks, seal problems, or other pressure-related issues. Keep the hose short, sloped downward, and easy to inspect in winter.
Q: How often does the factory CCV filter need to be replaced if I do not reroute it?
A: Cummins commonly lists a 67,500-mile CCV filter service interval for many 6.7L applications, but some owners report restriction messages earlier depending on idle time, towing, engine load, blow-by level, and driving conditions. Always check your owner’s manual or service information.
Q: Will I smell oil fumes inside the cab after the reroute?
A: With an open breather hose, it is possible to smell oil vapors, especially at idle or when wind pushes vapor forward. Routing the hose farther back or using a catch can can reduce odor.
Q: Will a CCV reroute increase horsepower?
A: No, a CCV reroute does not directly add horsepower or torque. It is a reliability and intake-cleanliness modification. It may help prevent oil-soaked intercooler boots from slipping under high boost, but it is not a power adder.
Q: Does a CCV delete affect warranty or emissions compliance?
A: The CCV system is part of the factory crankcase ventilation and emissions-control design. Modifying it may affect emissions inspection or warranty coverage depending on local laws, vehicle use, and whether a failure is related to the modification.
John Lee
Mechanical Engineer | 10+ Years Experience
John has spent the last decade engineering and testing high-performance automotive components. Specializing in drivetrain durability and thermal management across Powerstroke, Cummins, and Duramax applications, he bridges the gap between OEM limitations and aftermarket performance. His philosophy: "Factory parts are just a starting point."
Ready to Check the Cummins CCV Reroute Kit?
If a reroute fits your use case, start with the SPELAB 6.7 Cummins CCV reroute kit product page to confirm model-year fitment and included components. If you are still comparing catch can and reroute options, browse the Cummins CCV collection first.