A Duramax CCV reroute setup (Crankcase Ventilation reroute) is a popular reliability and performance upgrade for 6.6L Duramax engines, including LB7, LLY, LBZ, LMM, LML, and L5P platforms. It is designed to redirect oil vapor and blow-by gases away from the intake system, helping keep the engine cleaner and improving long-term durability.

Over time, the factory CCV system can send oil mist back into the intake, intercooler, and turbo piping. This can lead to carbon buildup, reduced efficiency, and increased maintenance needs.

What Is a Duramax CCV Reroute Setup?

A Duramax CCV reroute setup replaces or modifies the factory crankcase ventilation system so that oil vapors are no longer recirculated into the intake system.

Instead, the system typically:

• Redirects crankcase gases away from the turbo inlet
• Uses external venting or filtered catch systems
• Prevents oil mist from entering intake piping
• Improves air cleanliness entering the engine

Some setups are simple hose reroutes, while others include catch cans or filtration systems.

Benefits of a Duramax CCV Reroute Setup

Installing a Duramax CCV reroute setup provides several important performance and maintenance advantages.

Cleaner Intake System

One of the biggest benefits is reducing oil buildup in the intake and intercooler system.

Improved Turbo Efficiency

Cleaner air entering the turbo helps maintain more consistent airflow and performance.

Reduced Carbon Deposits

Less oil vapor in the intake reduces long-term soot and sludge buildup.

Better Engine Longevity

Keeping internal air passages cleaner helps reduce wear over time.

Improved Boost Stability

Oil-free intake piping can help maintain more stable airflow under boost conditions.

How a CCV Reroute Works

In a factory Duramax setup, crankcase gases are routed back into the intake to be burned again. These gases contain oil vapor that slowly coats intake components.

A Duramax CCV reroute setup changes this flow path so that:

• Blow-by gases are redirected externally or into a catch system
• Oil vapor is separated instead of entering the intake
• The turbo receives cleaner, denser air

This improves both cleanliness and efficiency.

Types of CCV Reroute Systems

There are different versions of a Duramax CCV reroute setup depending on performance needs.

Basic Reroute Hose Kit

• Simple hose replacement system
• Redirects vapors away from intake
• Budget-friendly option

Catch Can Setup

• Uses filtration chamber to trap oil mist
• Keeps engine bay cleaner
• Requires periodic maintenance

High-Performance CCV Systems

• Advanced filtration or venting design
• Designed for heavily modified engines
• Best for long-term cleanliness and performance

Installation Overview

Installing a Duramax CCV reroute setup is generally simple and can be done with basic tools.