K&N Motorcycle Oil Filter KN-138C — High-Flow Synthetic Media, Welded Nut for Quick Service

The K&N Motorcycle Oil Filter KN-138C is a premium, high-flow powersports filter built with synthetic media and heavy-duty construction to protect engines up to 20,000 miles while simplifying oil changes.

This K&N Performance Oil Filter is engineered specifically for powersports applications where high oil flow, excellent contaminant capture, and rugged durability matter. It uses advanced synthetic filter media and a reinforced housing to stand up to demanding riding conditions. The KN-138C is a direct replacement for many Aprilia and Suzuki models and other compatible vehicles, offering a welded nut for faster, cleaner service and a bypass valve tuned for synthetic oils.

How does the KN-138C improve engine protection without reducing flow?

The KN-138C balances filtration efficiency with unrestricted oil delivery by using premium synthetic media arranged in uniform pleats. This structure traps fine particles while maintaining high flow rates so lubrication reaches critical engine components under varied riding loads.

• Premium synthetic, high-efficiency media for fine contaminant capture
• Uniform pleat design that preserves oil flow under pressure
• Part-specific bypass/pressure relief valve engineered for synthetic oils

Is this filter durable enough for long service intervals and tough riding?

Yes — the KN-138C is built with heavy-duty materials and laboratory-tested strength for capacity and burst resistance. K&N rates the filter for up to 20,000 miles of protection depending on riding conditions and oil type, making it suitable for extended-change schedules when used with recommended oils.

• Laboratory-tested for filtration capacity and burst strength
• Robust housing designed for vibration and heat common to motorcycles
• Compatible with conventional, blended, and premium synthetic oils

How does the KN-138C make oil changes faster and cleaner?

The filter includes an integrated welded nut on the end cap so you can use a standard wrench or socket to remove it cleanly and quickly. That built-in feature reduces fumbling and helps prevent spills, while the application-specific fit makes installation straightforward.

• Welded nut for quick removal with common tools
• Direct factory-replacement fit for many Aprilia and Suzuki models
• Designed for easy installation and secure seating to prevent leaks

Which motorcycles and ATVs are compatible with this K&N filter?

The KN-138C fits a wide range of powersports machines across Aprilia and Suzuki model years listed by the manufacturer, from sportbikes and V-Strom adventure bikes to cruisers and KingQuad ATVs. Always verify fitment against your vehicle’s year and model before purchasing.

• Fits many Aprilia RS, Tuono and RSV models and multiple Suzuki GSX, GSXS, V-Strom, SV, Boulevard, Intruder, KingQuad and Hayabusa models
• Check vehicle compatibility list or consult dealer parts guide for confirmation
• Designed as application-specific where applicable for proper sealing and performance

Who is this for? The K&N KN-138C is aimed at riders and technicians who want durable, high-capacity filtration that supports extended oil-change intervals when paired with quality oils. It's a good choice for weekend riders, long-distance commuters, track-day enthusiasts, and owners of Aprilia and Suzuki machines seeking an OEM-fit alternative with performance-minded design features. If you value reliable oil flow, straightforward servicing, and strong contaminant retention in a powersports-specific filter, the KN-138C is designed to deliver.

Features summary:

• LONG-LIFE PROTECTION: Engineered for up to 20,000 miles of protection and compatible with premium synthetic, conventional, and blended oil types.
• OUTSTANDING FILTRATION: Premium synthetic, high efficiency media with uniform pleats delivers exceptional filtration while maintaining high oil flow rates for better engine performance.
• EXTENSIVELY TESTED: Laboratory tested to ensure excellent capacity and burst strength.
• DIRECT FACOTRY REPLACEMENT: Made to be application specific (where applicable) & designed for easy installation.
• PERFORMANCE ENGINEERED DESIGN: Includes a part number-specific bypass/pressure relief valve and is optimized for use with high-end synthetic motor oils.