PC Racing FLO PCS4B Reusable Spin-On Oil Filter – High-Flow Stainless Filter for Harley Touring & Milwaukee-Eight

Overview

Introducing the PC Racing FLO PCS4B, a reusable spin-on oil filter crafted from laser-cut 304 stainless steel and a micronic filter fabric. It delivers more filtration surface, helping maintain steady oil flow across demanding riding conditions. This isn’t about a single ride; it’s about consistently clean oil paths that support reliable performance under heat, vibration, and startup stress.

The design leverages a welded pleat seam and a stainless mesh that targets particles down to 35 microns, offering filtration capabilities that surpass many disposable filters. The result can feel like steadier oil pressure during high RPMs, with a filtration system built to endure extreme heat and moisture without compromising flow.

Key benefits at a glance

• High-flow stainless filtration with 35-micron efficiency for cleaner oil paths
• About 200% more filter area than many standard spin-on options
• Welded seam construction rated to withstand up to 600°F
• Reusable and easy to clean, reducing waste and ongoing costs

How it works

The FLO filter uses a precision stainless mesh that maintains steady flow even when heat builds or water intrudes. A built-in bypass valve helps ensure continuous oil supply to the engine, while a magnetic prefilter helps trap metallic particles before they can circulate.

• Premium black CNC-machined housing with anodized fins for heat dissipation and a refined look
• Racing-grade filtration technology adapted for Harley-Davidson touring models and related engines
• Designed to support longer intervals between changes when used under real-world riding conditions

Care and maintenance

• Note the original filter position to ensure correct installation
• Clean the filter at each oil change with solvent, contact cleaner, kerosene, or similar degreasing agents
• Blow air through the filter from the inside out to remove tiny particles and cleaning residue
• Lubricate rubber parts with clean oil before reinstalling

Compatibility and use

Designed as a direct replacement for OEM spin-on filters on Harley-Davidson Touring models and other Twin Cam or Milwaukee-Eight engines from 1999 through 2025. The FLO PCS4B is also listed for a broad range of bikes and European models in the fitment guide, making it a versatile upgrade for riders who value flow, filtration, and a premium look.