K&N Air Oil Separator for 2011–2023 Ford F-150 & Raptor — High-Capacity Catch Can, Easy Install

The K&N Air Oil Separator 81-0800 captures crankcase oil and contaminants to protect your F-150 or Raptor’s intake and maintain engine performance.

Designed specifically for 2011–2023 Ford F150 models (and 2017–2023 F150 Raptor plus select 2018–2021 Expeditions), the K&N Air Oil Separator (AOS) replaces the factory PCV routing with a high-capacity reservoir that traps oil and blowby before it reaches the intake tract. Engineered to fit using factory-style hose connections, this K&N unit simplifies installation and routine maintenance while offering long-term protection backed by a No-Hassle Lifetime Limited Warranty. Note: not legal for sale or use in California on pollution-controlled motor vehicles.

How does the AOS reduce oil buildup in the intake manifold?

The K&N AOS intercepts crankcase vapors and condenses oil droplets into a dedicated collector, stopping them from being pulled into the intake manifold. By removing oil from the ventilation stream, it helps keep intake valves and runners cleaner and reduces the chance of carbon buildup that can affect performance.

• High-capacity reservoir captures oil and blowby for extended service intervals.
• Internal baffles and media separate liquid oil from vapors effectively.
• Direct replacement of factory PCV hose routing for correct fit and flow.

Will installing this part affect engine performance or drivability?

When installed correctly, the AOS preserves factory crankcase ventilation while preventing oil ingestion, so drivability and emissions systems operate normally. The separator is designed to maintain required ventilation flow and avoid unwanted vacuum changes that could upset engine sensors or idle characteristics.

• Factory-style hose connections maintain stock flow dynamics.
• Engineered for vehicle-specific fit to prevent leaks or restriction.
• Helps protect horsepower by preventing oil-related intake fouling.

How difficult is installation and routine maintenance?

Installation is straightforward and usually takes about 30 minutes with basic tools; the K&N AOS uses snap-on factory-style hoses so lines stay secure without complex adapters. Checking and emptying the oil collector requires no specialty tools—simply remove the drain or service cap as directed in the instructions.

• Quick 30-minute installer-friendly design for most owners or shops.
• Uses OEM-style connectors and durable hoses for simple hookup.
• No tools required to check and empty the reservoir during routine service.

What vehicles and warranty coverage apply to part 81-0800?

This unit is engineered to fit 2011–2023 Ford F150 platforms, 2017–2023 F150 Raptor variants, and certain 2018–2021 Ford Expedition models—confirm fitment for your VIN prior to purchase. K&N backs the AOS with a No-Hassle Lifetime Limited Warranty that covers defects in materials and workmanship under normal use.

• Vehicle-specific engineering ensures correct fit for listed models.
• No-Hassle Lifetime Limited Warranty from K&N for covered defects.
• Not legal for sale or use in California on pollution-controlled vehicles; verify local regulations.

Who is this for: The K&N Air Oil Separator 81-0800 is ideal for F-150 and Raptor owners who want a straightforward, durable solution to prevent oil and blowby from contaminating the intake system—especially those who tow, haul, or drive in stop-and-go conditions where blowby is more common. It also suits enthusiasts performing routine maintenance themselves and professional shops needing a vehicle-specific catch can option backed by a well-known filter and accessory brand.