K&N Oil Filter - Black — Harley-Davidson Road King, Softail Fat Boy, Softail Heritage Classic (1989-2023)

K&N oil filter in black finish, engineered with synthetic pleated media to handle synthetic and synthetic-blend oils at high flow rates. Heavy-duty canister with anti-drain-back valve keeps your motor running clean without sacrificing oil pressure.

Features

• Synthetic pleated media for high flow rates
• 17mm hex nut for easy on-off installation
• Anti-drain-back valve prevents dry starts
• Pressure relief valve protects against over-pressure
• Pre-lubed base gasket for optimum seal
• TÜV production monitored for quality assurance
• Heavy-duty canister with double-rolled seal

Specifications

• Brand: K&N
• Manufacturer Part #: KN-171B
• UPC: 024844087737
• Finish: Black
• Length: 3 in
• Width: 3 in
• Height: 4.3 in
• Weight: 0.8 lbs
• Country of Origin: Thailand

Fitment

Designed for motorcycles and vehicles using synthetic or synthetic-blend motor oils that require high-flow filtration.

Frequently Asked Questions

What makes this filter work with synthetic oils?

The synthetic pleated media is engineered to maintain high flow rates and protect against the concentrated additives found in full synthetic and synthetic-blend oils.

Does it have an anti-drain-back valve?

Yes — the anti-drain-back valve prevents oil from draining out of the filter when the engine is off, protecting against dry starts.

How often should I change this filter?

Follow your motorcycle manufacturer's recommended service interval, typically every 5,000–10,000 miles depending on your bike and riding conditions.

Is the gasket pre-lubricated?

Yes — the base gasket comes pre-lubed. Apply a light coat of fresh oil to the rubber gasket before installation for an optimum seal.

What's the warranty?

K&N backs this filter with the K&N Limited Warranty against manufacturing defects.