The Ultimate Guide to 2017–2026 L5P 6.6L Duramax CCV Reroute/Delete Kit

🔧 What Is the CCV System and Why It Matters

Your Crankcase Ventilation (CCV) system plays a critical role in managing blow-by gases that escape from the combustion chamber.

In stock form, the factory CCV system on the L5P Duramax routes these gases — along with traces of oil vapor — back into the intake system.

While this setup meets emissions standards, it comes with a few major downsides for long-term engine health and performance.

⚠️ Common Problems with the Factory CCV System

Plastic Components That Crack Over Time

The OEM system uses plastic fittings that can crack or warp under high heat and pressure. Once they fail, you'll likely notice oil leaks, reduced performance, and possible contamination inside the intake.

Oil Carryover and Intake Contamination

The factory design allows oil mist to flow back into the intake track. Over time, this creates oil buildup, carbon deposits, and intake restriction, which reduce power output and throttle response.

Hot Air Recirculation

The CCV system also recirculates hot crankcase gases into the turbo inlet. This raises intake air temperatures, disturbing the optimal air-fuel ratio and increasing fuel consumption and emissions.

✅ The Solution: Install a CCV Reroute/Delete Kit

The CCV reroute/delete kit eliminates these inefficiencies by redirecting crankcase gases away from the intake system.

Here's how it improves your Duramax's performance and reliability.

💪 Enhanced Durability and Reliability

High-quality kits replace fragile OEM plastic with CNC-machined aluminum components and oil-resistant silicone hoses.

This ensures your system remains leak-free even under extreme heat and boosted pressure.

The result? A cleaner engine bay and long-term dependability for your Powerstroke or Duramax.

⚡ Improved Engine Performance

By preventing oil mist and hot gases from entering the intake, your engine breathes cooler, denser air — the key to efficient combustion.

Expect to notice:

• Better throttle response
• Increased horsepower and torque
• Lower exhaust gas temperatures (EGTs)
• Improved towing power and fuel efficiency

🧼 Cleaner Intake System

Oil buildup in the intake is a silent killer of performance.

The CCV reroute kit keeps your intake track clean by venting gases externally or through an oil-separating system.

No more oil-soaked boots, turbo fouling, or carbon buildup — just consistent, efficient airflow.

🛠️ Easy Installation & Maintenance

Most L5P CCV reroute kits are bolt-on installations, requiring basic hand tools and 30–60 minutes of work.

Each kit includes:

• Pre-cut reinforced hoses
• Precision aluminum fittings
• Mounting hardware & detailed instructions

Many also feature a relocated oil fill point, making future oil changes and top-ups far more convenient.

🚚 Compatibility

This CCV Reroute/Delete Kit is engineered specifically for:

• 2017–2026 Chevy Silverado 2500HD / 3500HD (6.6L L5P Duramax)
• 2017–2026 GMC Sierra 2500HD / 3500HD (6.6L L5P Duramax)

Not compatible with 3500/4500/5500 Cab & Chassis models.

🧠 Why Every Duramax Owner Should Consider This Upgrade

If you're serious about maintaining your truck's power, fuel economy, and reliability, this is a must-have performance upgrade.

A CCV reroute kit:

• Reduces oil contamination
• Improves combustion efficiency
• Extends turbo and intercooler lifespan
• Helps maintain consistent boost pressure
• Enhances long-term engine health

L5P 6.6L Duramax CCV Reroute Kit 

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🏁 Final Thoughts

Your L5P Duramax is already a powerhouse — but with a CCV reroute/delete kit, you unleash its full potential.

Enjoy cleaner intake airflow, improved reliability, and longer engine life.

Whether you're towing, racing, or daily driving, this simple upgrade delivers measurable results.