K&N Racing Oil Filter – Suzuki GSX-R 1000 (2003–2023) KN-138

When every lap demands reliable oil pressure and clean lubrication, the K&N KN-138 racing oil filter delivers where it counts. Purpose-built to withstand the extreme oil pressures, sustained high revs and intense thermal cycles of track use, this filter is the go-to upgrade for GSX-R 1000 owners who demand more than standard fitment.

Key Features

• 17 mm hex fitting allows fast, tool-box-standard installation and removal — no specialist tools required.
• Safety-wire drilling through the hex enables mandatory wire-locking for circuit scrutineering, adding peace of mind on road or track alike.
• Housing walls are 50% thicker than conventional filters, giving the KN-138 the structural rigidity to cope with racing oil pressures and thermal shock.
• Reinforced baseplate with a double-rolled sealing edge locks the filter body together under sustained stress, preventing bypass or blowout.
• Synthetic filter media provides maximum filtration efficiency, stripping contaminants from the oil before they reach critical engine components.
• Pre-lubricated O-ring ensures a clean, leak-free seal from the moment of installation — critical during a quick service between sessions.
• Uprated pressure-relief valve guards against filter over-pressurisation, keeping oil flowing to the engine even under worst-case cold-start or racing conditions.
• Fully compatible with modern synthetic engine oils and racing-grade lubricants.

Built for the Racetrack, Ready for the Road

The KN-138 is engineered to exceed the original equipment specification for the Suzuki GSX-R 1000 across the entire 2003–2023 production run. The reinforced canister construction and high-flow synthetic filter medium mean oil delivery remains consistent whether you are exiting a fast chicane at maximum rpm or commuting on the public road. The safety-wire port is not a marketing detail — it is there for riders who run their machine under racing regulations and cannot afford a filter backing off mid-session.

Filtration Performance

K&N's synthetic filter medium is selected for its combination of high dirt-holding capacity and low restriction. Maintaining strong oil flow at elevated temperatures and engine speeds ensures bearing surfaces, the crankshaft and the valve train receive uninterrupted lubrication even during hard acceleration and sustained high-speed running. The updated pressure-relief valve calibration is a measurable improvement over earlier K&N generations, providing an additional layer of protection during cold starts when oil viscosity is at its highest.

Fitment & Compatibility

The K&N KN-138 oil filter is a direct replacement for the following models:

• Suzuki GSX-R 1000 — all variants, 2003 to 2023

Specifications

• Part number: KN-138
• Brand: K&N
• Filter type: Spin-on racing oil filter
• Hex size: 17 mm
• Housing wall thickness: 50% thicker than standard
• Filter medium: Synthetic
• Safety-wire port: Yes — drilled through hex
• O-ring: Pre-lubricated, double-rolled seal
• Fitment: Suzuki GSX-R 1000 (2003–2023)