Collection: Duramax CCV/PCV Reroute

1. What is the CCV system for diesel trucks?

For diesel truck owners, understanding the factory Crankcase Ventilation (CCV) system is essential to maintain performance, reduce emissions, and avoid long-term damage.

Whether you own a 2011 GM 2500HD LML Duramax or a 2017 Chevrolet Silverado 3500HD with a 6.6L Duramax L5P, the CCV system plays a key role in managing engine pressure and controlling oil vapor from crankcase blow-by gases.

Let’s take a closer look at the major components of a factory (OEM) CCV system:

1.1 CCV Filter

The CCV filter captures oil mist and microscopic particles from the crankcase gases. This filter is mounted on top of the valve cover and needs to be replaced every 67,500 miles to maintain efficiency and prevent oil saturation.

1.2 Oil Separator

The oil separator is often built into the valve cover. It uses baffles or mesh to physically separate oil droplets from gases. The oil drains back to the oil pan, while cleaned vapors continue into the intake.

1.3 CCV Valve / Pressure Control Valve

Also known as the PCV valve, this part regulates crankcase pressure. The CCV valve helps prevent excess pressure that could cause oil leaks, or too much vacuum that can draw contaminants into the system.

1.4 Ventilation Hoses

These connect the crankcase, filter, and intake system. The hose routing is engineered to move filtered vapors back to the turbo inlet, maintaining a closed system to comply with EPA emissions standards.

Although the CCV system is designed with emissions and pressure control in mind, it can become a liability over time. Diesel truck owners often face problems like clogged CCV filters, oil build-up in the intake, and reduced performance. That’s why many eventually choose to upgrade or bypass the system using a CCV delete kit or reroute solution.

2. Why Should You Upgrade or Delete Your CCV System?

Over time, the factory CCV system on diesel trucks like 6.6L Duramax often becomes a source of performance inefficiencies and maintenance headaches.

2.1 How a CCV Filter Causes Intake Oil Build-Up and Pressure Issues

The primary purpose of the OEM CCV system is to control crankcase pressure and redirect blow-by gases—including oil vapor—back into the intake system to meet emissions standards. However, this process introduces several long-term issues that make a strong case for upgrading or deleting the system altogether.

As oil vapors cycle through the intake, they gradually accumulate along the intercooler piping, intake valves, MAP and IAT sensors, and even the turbocharger. This oil film reduces intake efficiency, raises exhaust gas temperatures, and contributes to carbon buildup, especially in engines equipped with EGR systems. 

The CCV filter itself becomes saturated over time, which requires filter replacement roughly every 67,500 miles—leading to increased crankcase pressure, oil seepage from gaskets, and even compromised turbo seals.

2.2 A CCV Delete Kit Eliminates Oil Recirculation

Replacing the OEM system with a CCV delete kit or CCV reroute kit removes the oil vapor loop entirely. Instead of recycling oil-laden gases, these kits reroute or vent the crankcase through a sealed catch can or breather, capturing contaminants before they reach the intake. 

This modification significantly reduces the risk of oil pooling in the intercooler, minimizes sensor fouling, and improves air-fuel efficiency. On average, catch cans in a CCV delete system can collect between 3–6 ounces of oil every 3,000 miles, depending on driving conditions and engine wear.

The result is a cleaner intake tract, improved combustion efficiency, fewer emissions-related maintenance issues, and a more stable crankcase pressure environment. For performance builds or high-mileage trucks, the long-term gains in engine cleanliness, reduced EGTs, and component longevity make a CCV delete a highly practical upgrade.

3. What’s Included in a CCV Delete Kit, and What OEM Parts Does It Replace?

Upgrading to a CCV delete kit isn’t just about adding an aftermarket component—it’s about completely replacing and improving several factory-installed parts. These kits are designed to simplify the crankcase ventilation system, reduce maintenance, and eliminate the downsides of recirculated oil vapor.

Here’s a breakdown of what you typically get in a quality CCV delete kit—and which OEM components they’re designed to replace:

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3.1 CCV Delete Kit Components

Most DPFExhaust CCV delete kits include the following parts:

• Billet CCV cover or sealed plate
  Replaces the factory CCV filter housing or valve cover vent port.

• Catch can with internal baffling (optional in some kits)
  Collects oil mist from blow-by gases before they exit the system.

• Reinforced silicone or braided ventilation hoses
  Routes gases to a new exit point, often via atmosphere or catch can.

• Mounting hardware and brackets
  For secure installation of the catch can and rerouted hose system.

• Breather or filter element
  Allows pressure release to atmosphere in open systems, where permitted.

3.2 OEM Parts Replaced or Bypassed

Depending on your engine, some components are fully integrated into the valve cover, requiring the delete kit to bypass the entire OEM configuration through external routing and block-off elements.

4. CCV Delete/ CCV Upgrade Kit Pros And Cons

A CCV delete kit or CCV upgrade system is more than just a hardware swap—it's a targeted solution designed to resolve long-term issues caused by the stock crankcase ventilation system on diesel trucks like 6.6L Duramax.

4.1 Pros: Why It’s a Smart Upgrade

1. Stops Oil Contamination in the Intake System
The factory CCV system routes oil-laden blow-by gases back into the intake. Over time, this results in oil buildup in the intercooler piping, turbocharger, and intake valves. Deleting or rerouting this system eliminates this contamination.

2. Prevents Crankcase Overpressure
Saturated OEM CCV filters—like the one used on the 6.7 Cummins CV52001—can cause internal pressure to rise. This leads to oil seepage from seals and potential turbo damage. A CCV delete stabilizes crankcase pressure, reducing wear on internal components.

3. Simplifies Maintenance
No more replacing filters every 67,500 miles. Instead, catch can-equipped systems just need occasional draining. On average, a catch can captures 3–6 ounces of oil every 3,000–5,000 miles, depending on driving style and engine wear.

4. Improves Combustion and Airflow
By eliminating oil vapor from the intake, combustion becomes more efficient. Users report improved throttle response, reduced EGTs, and more stable boost levels—especially in tuned setups or heavy towing conditions.

5. Cleaner Engine Bay, Fewer Emissions-Related Issues
Less oil circulating through the intake means cleaner sensors (MAP, IAT), fewer carbon deposits, and lower chances of triggering check engine lights due to oily residue.

4.2 Cons: What You Should Be Aware Of

1. Not Legal for On-Road Use in All States
In some regions, deleting any emissions-related equipment—including CCV systems—is not road legal. These kits are typically intended for off-road or race applications only.

2. Installation May Require Moderate Mechanical Knowledge
Depending on your engine, some installs involve removing valve cover vents or rerouting hoses in tight engine bays. While bolt-on, it’s not always beginner-friendly.

3. Catch Can Maintenance Still Required
Though filter replacements are eliminated, catch cans still need to be checked and drained regularly to avoid overflow and pressure issues.

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DPFExhaust testing and customer data have shown that properly installed CCV delete kits can eliminate up to 100% of intake oil contamination, lower exhaust gas temperatures under load, and help extend turbo and EGR component life. For high-mileage diesel owners or performance-focused builds, the tradeoff is overwhelmingly in favor of the upgrade.

5. CCV Delete Kit Fitment Guide: Powerstroke, Cummins & Duramax

Before purchasing a CCV delete kit, it's essential to verify that the system is compatible with your specific truck model, engine configuration, and production year. DPFExhaust offers a wide range of CCV delete and upgrade kits engineered to fit the most popular Duramax diesel platforms, from 2004 LLY to 2025 L5P Duramax engines.

Here’s a comprehensive fitment guide to help you find the right kit for your truck:

5.1 Supported Vehicle engines

5.2 Kit Compatibility Tips

• For 2004+ Duramax models, verify whether your intake routing has been modified or tuned, as certain catch can placements may vary by application.

6. How to Install CCV PCV Reroute Kit

6.1 Estimated Installation Time and Cost

• Time required: 1 to 1.5 hours

• Tools needed: Flathead screwdriver, socket set (8mm/10mm), hose cutter, pliers

• DIY cost: ~$60–$120 depending on the kit style (open breather or catch can)

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6.2 Installation Guide

Duramax CCV Filter

• 2017-2024 L5P CCV Reroute/Delete Kit
• 2011-2016 LML 6.6L Duramax CCV Reroute Kit
• 2004-2010 6.6L CCV PCV Reroute Kit

7. Top 5 CCV Combo Recommendations

For diesel owners who are serious about performance, longevity, and reducing maintenance headaches, pairing a CCV delete kit with other key upgrades can unlock even more value. 

Here are five proven CCV upgrade combos recommended by the DPFExhaust team and trusted by diesel enthusiasts:

7.1 CCV Delete Kit + EGR Delete Kit

Why it works:
Both the CCV and EGR systems contribute to intake contamination. Oil mist from the CCV and carbon from the EGR mix into thick deposits on your intake valves and sensors.

Benefits:

• Up to 95% reduction in intake buildup

• Lower exhaust gas temperatures

• Smoother throttle response
  Best for: Heavy towing, high-mileage diesels

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7.2 CCV Delete + ECU Tuner

Why it works:
Deleting the CCV system allows for cleaner airflow. Pairing that with a tune optimizes fuel delivery and boost management.

Benefits:

• More horsepower and torque

• Better turbo spool-up

• Reduced soot generation in closed systems
  Best for: Tuned daily drivers or weekend builds

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7.3 CCV Delete + Upgraded Intake Elbow

Why it works:
Once the CCV system stops contaminating the intake, upgrading the elbow further increases clean air delivery.

Benefits:

• Improved airflow efficiency

• Cooler intake temps

• Cleaner combustion
  Best for: Any truck using a catch can or open breather system

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7.4 CCV Delete + Catch Can + High-Flow Air Filter

Why it works:
Catch cans separate oil mist, while a high-flow air filter ensures that only clean air enters the engine.

Benefits:

• Nearly 100% oil vapor removal

• Improved filtration over OEM systems

• Less sensor fouling
  Best for: 6.7 Cummins and 6.7 Powerstroke platforms with frequent stop-start driving

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7.5 CCV Delete + Coolant Bypass Kit

Why it works:
As you push your engine harder, managing both air and coolant is key. This combo improves pressure regulation and temperature balance.

Benefits:

• Reduced rear-cylinder hotspots

• Protects head gaskets

• Balanced coolant flow
  Best for: Long-haul, lifted trucks or tuned builds in hot climates

8. CCV Delete Kit FAQ

Q1: Is a CCV delete kit legal for street use?

A: In most U.S. states, CCV delete kits are considered emissions-related modifications and are not legal for on-road use. These kits are intended for off-road, competition, or race-use vehicles only. Always check local and federal emissions regulations before installing.

Q2: What happens if I don’t replace my CCV filter?

A: A saturated CCV filter can lead to increased crankcase pressure, oil leaks, and possible damage to turbo seals or gaskets. On the 6.7 Cummins, the factory filter (CV52001) is recommended to be replaced every ~67,500 miles. A CCV delete kit eliminates this ongoing maintenance cost.

Q3: Do I need to retune my truck after installing a CCV delete?

A: No tuning is required for most CCV delete kits, including those for 2020 RAM 2500 6.7 Cummins and 2015 Ford F250 6.7 Powerstroke. However, pairing it with a tune can enhance engine response and optimize airflow, especially if combined with intake or EGR modifications.

Q4: Will a CCV delete kit improve fuel economy or performance?

A: While a CCV delete won't increase horsepower by itself, it reduces intake restriction and lowers oil contamination, resulting in more efficient combustion. This can lead to smoother throttle response, better turbo efficiency, and potential fuel economy gains, especially under load.

Q5: How do I know if my truck is compatible?

A: DPFExhaust CCV delete kits are designed for specific diesel platforms including:

• 2011–2024 Ford F250/F350/F450 (6.7L Powerstroke)

• 2007.5–2024 RAM 2500/3500 (6.7L Cummins)

• 2008–2010 Ford Super Duty (6.4L Powerstroke)

• 2004–2024 Chevy Silverado / GMC Sierra 2500HD & 3500HD (LML / L5P Duramax)
  Check the product title or fitment chart to confirm compatibility with your vehicle’s year, model, and engine.

Q6: Do I need a catch can or just a breather?

A: It depends on your driving conditions and local laws.

• Catch cans are ideal for daily drivers and tuned trucks because they capture and store blow-by oil.

• Breather filters are easier to install and better for off-road or race setups where vapor can safely vent to atmosphere.

Q7: Will I need to drain the catch can often?

A: On average, expect to drain 3–6 ounces of oil every 3,000–5,000 miles depending on engine health and load. A visual inspection every oil change is typically enough. DPFExhaust catch cans include easy-access drain valves for convenience.

Q8: Can I do a CCV delete on a 7.3 Powerstroke?

A: Yes, the 7.3 Powerstroke (especially 1999–2003 models) can benefit from a CCV mod or delete, though it’s more commonly referred to as a CCV reroute on this platform. The stock system vents crankcase gases into the intake tube just before the turbo. By rerouting it to atmosphere or a catch can, you can prevent oil from entering the turbo and intercooler system. This is a popular and cost-effective upgrade among 7.3L owners.

Q9: What’s the difference between a CCV reroute and a full delete on Powerstroke engines?

A: A CCV reroute typically redirects blow-by gases to a new location—usually atmosphere or a catch can—while keeping the factory breather components intact. A full CCV delete, like those available for the 6.7 Powerstroke, replaces or bypasses the OEM filter, separator, and recirculation hoses completely. The choice depends on how much you want to simplify the system and whether you need to stay emissions compliant.

Q10: Is there a specific CCV delete kit for the 6.7 Powerstroke?

A: Yes. DPFExhaust offers a 6.7 Powerstroke CCV delete kit designed for 2011–2024 Ford Super Duty models (F250/F350/F450). These kits replace the factory separator system and include billet adapters, hoses, and optional catch cans. Installation is typically bolt-on and does not require tuning, but always confirm your engine configuration and local emissions laws before modifying.