K&N KN-303 Engine Oil Filter

K&N KN-303 Oil Filter Overview

The K&N KN-303 oil filter is a spin-on engine oil filter built for powersports applications that use M20 x 1.5 threads. It uses high flow premium synthetic-blend media to work with synthetic, petroleum-based, and blended oils, including high-concentration racing oils.

Compatible With Honda, Yamaha, and other powersports applications that specify the KN-303 oil filter format, this filter combines durable construction with service-friendly removal features. The KN-303 is also referenced by part number KN-303 for direct replacement searches.

Key Features

• High flow premium media for efficient oil filtration
• Spin-on design with M20 x 1.5 thread specification
• 17 mm welded hex nut for easier removal
• Anti-drain back valve helps retain oil in the filter
• Bypass valve and PSI relief valve included
• Nitrile rubber gasket material
• Heavy-duty canister construction
• 1-year limited warranty

Detailed Product Description

The K&N KN-303 oil filter is engineered for engines that need consistent oil flow and dependable contaminant control. Its synthetic-blend filtration media is designed for use with synthetic, petroleum-based, and blended motor oils, making it a practical choice for riders and owners who service engines with performance-oriented oil formulations. The 3.25-inch height and 2.594-inch outside diameter support a compact spin-on fitment profile, while the welded 17 mm nut simplifies removal during routine maintenance.

For fitment-based searches, this oil filter is commonly cross-shopped by owners looking for a KN-303 oil filter for Honda and Yamaha powersports applications. This part cross-references 15410MM5003 and PH6017A for the same application.

What It Helps Address

• Restricted oil flow caused by a loaded or inefficient filter
• Oil contamination from normal engine wear particles
• Hard-to-remove filters during scheduled service
• Oil drain-back after shutdown
• Pressure spikes that can occur during cold starts or high-flow operation

Installation Notes and Tips

Verify the thread specification, filter height, and outside diameter before installation. The KN-303 uses a spin-on design with a 17 mm removal nut, so a wrench may be used for service if needed. Always follow the vehicle manufacturer’s oil change interval and confirm the correct sealing surface and gasket contact before returning the engine to service.

For buyers searching Honda or Yamaha oil filter replacement options, confirm the engine’s required M20 x 1.5 spin-on filter specification before ordering. The KN-303 part number should be matched to the application listed by the vehicle manufacturer or service catalog.

Quality Assurance

K&N backs the KN-303 with a 1-year limited warranty. The filter is built with a heavy-duty canister and filtration media selected for high-flow oil service in powersports engines.