K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can - K&N Engineering KNN81-0812
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K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can

KNN81-0812
024844401366
Oil Separators
20 Units In Stock
$ 157.99
$ 157.99

The K&N 81-0812 Air Oil Separator captures blow-by oil in a 6oz high-capacity reservoir to shield your 6.6L engine and intake tract from contamination. Designed for 2020-2025 Chevy Silverado 2500 HD 3500 HD and GMC Sierra 2500 HD 3500 HD models it prevents power loss and detonation while reducing oil buildup. Quick 30-minute installation uses factory-style hose connections for direct fit replacement of the crankcase line.

Key Features

  • 6oz Reservoir: Large capacity holds more oil no tools needed to check or empty translucent design shows fill level.
  • Blow-By Protection: Captures oil mist from PCV system prevents contamination in intake tract and valves.
  • High-capacity design handles heavy blow-by from performance engines.
  • Durable translucent polymer reservoir with aluminum fittings for visibility and strength.

Fitment

Years Make Model Application
2020-2025 Chevrolet Silverado 2500 HD Custom, High Country, LT, LTZ, WT, ZR2
2020-2025 Chevrolet Silverado 3500 HD High Country, LT, LTZ, WT
2020-2025 GMC Sierra 2500 HD AT4, AT4X, Denali, Pro, SLE, SLT
2020-2025 GMC Sierra 3500 HD AT4, Denali, Pro, SLE, SLT

Specifications

Brand K&N Engineering
Manufacturer Part Number 81-0812
Product Type Oil Separators
Fitment Type Vehicle Specific
Condition New

What's Included

One new K&N oil separators identified by manufacturer part number 81-0812. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.

About K&N Engineering

K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.

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Frequently Asked Questions

How do I confirm K&N 81-0812 fits my vehicle?
Match the year, make, and model in the fitment table, then confirm the engine, factory housing, sensor layout, emissions notes, and any application restrictions stated for this exact part.

What should I verify before ordering K&N 81-0812?
Confirm the exact manufacturer part number, all dimensions, connection sizes, included components, material, and application notes. Do not select the part from appearance alone.

What should be checked after installing K&N 81-0812?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.

Installation Instructions

  • Disconnect battery unplug PCV hose from valve cover route through separator basic hand tools only.
  • Compatible with stock hardware no drilling or modifications required.

Request For Information

Have questions about K&N 20-23 GM 2500/3500 6.6L Oil Separator Catch Can? Fill out the form below and we'll get back to you by the next business day.
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