Spetuner Duramax PCV Reroute | Fix Oil Blow-By
Choose a Duramax PCV reroute kit by your truck’s model year and engine code. This collection covers three 6.6L Duramax groups: 2004–2010 LLY, LBZ, and LMM; 2011–2016 LML; and 2017–2024 L5P. Each kit redirects crankcase vapors away from the factory intake path to help reduce the oil mist entering the turbo piping and intercooler.
Important: These CCV/PCV reroute and delete products are intended exclusively for off-road or racing use. Removing, disabling, or altering emissions-related equipment on a vehicle operated on public roads may violate federal, state, or local law. Confirm the rules that apply to your vehicle and intended use before purchasing or installing a kit.
Find the Right Duramax PCV Reroute Kit
Fitment is the first thing to check. Match the model year and engine code shown on your truck—not the appearance of the components—to the options below.
| Truck and Engine |
Supported Years |
Correct Kit |
Important Fitment Note |
| Chevrolet Silverado or GMC Sierra HD, 6.6L L5P |
2017–2024 |
L5P CCV reroute/delete kit |
Fits listed Silverado and Sierra 2500/3500 HD applications; not compatible with Cab & Chassis 3500/4500/5500 models. |
| Chevrolet Silverado or GMC Sierra HD, 6.6L LML |
2011–2016 |
LML PCV reroute kit |
Built for the 6.6L LML platform; verify your engine code before ordering. |
| Chevrolet Silverado or GMC Sierra HD, 6.6L LLY, LBZ, or LMM |
2004–2010 |
LLY, LBZ, and LMM CCV/PCV reroute kit |
For the listed LLY, LBZ, and LMM applications only. |
This collection does not currently include a kit for the LB7, 2.8L LWN, 3.0L Duramax, 6.5L diesel, or L5P Cab & Chassis applications.
Why Reroute the Duramax Crankcase Ventilation System?
The factory closed crankcase ventilation system routes blow-by gases and suspended oil vapor back through the intake. A Duramax CCV reroute changes that path, helping limit the amount of oily vapor recirculated through intake-side components. If you want a closer look at the system before choosing a kit, this explanation of how a CCV reroute works covers its purpose and its relationship to crankcase blow-by.
- Helps reduce oil residue in the turbo inlet, charge piping, and intercooler
- Provides a platform-specific alternative to the factory CCV/PCV routing
- Addresses oily intake boots and related under-hood mess
- Offers dedicated options for LLY, LBZ, LMM, LML, and L5P engines
A reroute kit is not a repair for excessive crankcase pressure or a worn engine. If your truck has heavy smoke, rapid oil loss, abnormal pressure, or severe blow-by, diagnose the underlying mechanical condition before installing aftermarket ventilation components.
What to Check Before You Order
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Engine code: Confirm whether the truck has an LLY, LBZ, LMM, LML, or L5P engine.
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Model year: Do not select a kit solely because two engines share the same 6.6L displacement.
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Truck configuration: L5P Cab & Chassis models are specifically excluded from the listed L5P kit.
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Intended use: Review applicable emissions and vehicle-use laws before modifying the factory system.
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Installation requirements: Inspect the selected product page for its included components and application-specific notes.
If you have a 2017–2024 truck, review the L5P CCV reroute installation guide before beginning work. It covers the application-specific preparation, component checks, and routing process for the L5P platform. Do not apply its instructions to an LLY, LBZ, LMM, or LML engine.
Professional installation is recommended if you cannot confidently verify the truck’s engine code, component routing, connections, or legal eligibility.
