K&N Air Oil Separator Catch Can for 2014–2018 Silverado / 2015–2020 Tahoe (81-0805) — Vehicle-Specific, Tool-Free Drain

The K&N Air Oil Separator 81-0805 is a vehicle-specific catch can that captures crankcase oil and contaminants before they reach the intake, protecting engine components and helping preserve performance.

This bolt-in air oil separator is engineered to fit specified Chevrolet, GMC and Cadillac V8 trucks and SUVs from 2014–2020, replacing the factory crankcase vent line with a high-capacity reservoir and OEM-style connections. Installation typically takes about 30 minutes with basic hand tools, and the unit is designed to mount in a convenient engine bay location while allowing tool-free reservoir checks and draining. The separator helps reduce oil buildup in the intake tract and intake manifold by collecting blow-by oil and moisture in a dedicated canister.

How does this K&N catch can help my engine and intake?

The separator intercepts oil-laden crankcase vapors before they enter the intake, reducing deposit buildup on valves and in the manifold that can degrade performance over time. By collecting liquid oil and heavier particulates in a removable reservoir, it keeps the intake tract cleaner and helps maintain throttle and sensor responsiveness.

• Captures oil and condensate from crankcase blow-by
• Prevents oiling of intake runners and throttle bodies
• Helps reduce carbon and deposit formation on intake valves

Will installation fit my truck or SUV and how long does it take?

Each K&N 81-0805 is built for a specific list of models and model years, so fitment is vehicle-specific for select Silverado, Sierra, Tahoe, Suburban, Yukon and Escalade applications. Installation uses factory-style hose connectors and basic hardware so most installations finish in roughly half an hour with common hand tools.

• Uses OEM-style snap-on hose fittings for a secure connection
• Mounts to a convenient engine-bay location—no custom fabrication
• Tool-free reservoir inspection and drainage for easy maintenance

What materials and warranty back this K&N unit?

The separator is constructed from durable materials with premium connectors and hoses intended for long service life under normal operating conditions. K&N backs the part with a No-Hassle Lifetime Limited Warranty, offering support for defects in materials and workmanship per warranty terms.

• High-capacity internal reservoir engineered for extended service intervals
• Premium hoses and OEM-style fittings for reliable sealing and durability
• Lifetime limited warranty provided by K&N for qualified issues

Is this product street-legal everywhere?

Check local regulations before purchasing: this K&N Air Oil Separator is not legal for sale or use in California on pollution-controlled motor vehicles. States or regions with similar emissions rules may also restrict use, so verify compliance for your area and vehicle.

• Not legal for sale or use in California for pollution-controlled vehicles
• Verify local emissions rules or dealer guidance before installation
• Intended for model-specific applications—confirm exact fitment

Who is this for: The K&N 81-0805 Air Oil Separator is aimed at owners of compatible 2014–2020 Chevrolet, GMC and Cadillac trucks and SUVs who want to reduce oil contamination of their intake system, protect components from blow-by deposits, and simplify routine engine-bay maintenance. It suits daily drivers, tow rigs and lightly modified vehicles that value OEM-style fitment, quick installation and a high-capacity catch can solution.