K&N Motorcycle Oil Filter KN-138 - High-Performance Synthetic Media, Integrated Welded Nut

The K&N KN-138 is a performance motorcycle oil filter built with premium synthetic media and heavy-duty construction to deliver high oil flow and long-lasting engine protection for powersports applications.

Designed for riders who demand durable filtration and easy serviceability, the KN-138 combines high-efficiency synthetic filter material with a reinforced housing and an integrated welded nut for fast oil changes. It’s engineered to work with synthetic, conventional, and blended oils and is specified to meet many modern motorcycle, ATV and side-by-side applications from Suzuki and Aprilia models through multiple model years.

How does the KN-138 improve engine protection on the road or trail?

The KN-138 uses premium synthetic filter media with consistent pleat spacing to trap contaminants while maintaining strong oil flow. Laboratory testing confirms its dirt-holding capacity and burst strength, helping reduce wear when compared with lesser-quality filters.

• High-efficiency synthetic media captures fine particles without restricting oil circulation.
• Uniform pleats maximize surface area for longer service life.
• Tested capacity and burst strength for dependable performance under stress.

Will this filter work with my motorcycle and oil type?

The KN-138 is manufactured as an application-specific direct replacement for many Aprilia and Suzuki models (and other compatible machines) and supports synthetic, conventional, and blended oils. Always verify fitment against your vehicle’s model and year before purchase.

• Direct factory-replacement design for precise fit and simple installation.
• Optimized bypass/pressure relief valve matched to part number requirements.
• Compatible with premium synthetic oils and standard motor oil blends.

How long can I expect this filter to last between services?

K&N engineers the KN-138 for extended service intervals in line with recommended oil and riding conditions, with stated protection up to 20,000 miles under suitable maintenance and oil choices. Real-world interval depends on riding style, terrain, and oil change practices.

• Engineered for long-life protection, up to 20,000 miles when used with appropriate oil and conditions.
• Heavy-duty construction resists deformation at higher temperatures and pressures.
• Regular inspection and following manufacturer service intervals ensure optimal longevity.

What makes installation and maintenance easier for riders?

The KN-138 includes user-focused features to speed routine service and reduce hassle. Its integrated welded nut simplifies removal and installation, and the filter’s application-specific fit reduces the chance of leaks or misalignment.

• Welded nut on the filter body allows quicker, tool-friendly oil changes.
• Application-specific sizing for correct fit and reliable sealing.
• Robust housing and gasket materials resist common service wear points.

Compatibility note: this filter fits a wide range of Suzuki and Aprilia motorcycles, ATVs and utility models across many model years (examples include the Aprilia RS 660, Tuono 660 and V4 variants, and numerous Suzuki V-Strom, GSX, GSXS, GSXR, SV, Boulevard and KingQuad models). Always cross-reference the KN-138 with your vehicle’s OEM part number or fitment chart before ordering.

Who is this for: Riders, mechanics and fleet operators who prioritize lasting filtration, reliable oil flow and faster service will appreciate the KN-138. It’s a practical upgrade for sportbikes, adventure machines and utility ATVs that receive regular maintenance and benefit from high-performance synthetic oil compatibility.