How often should I clean and re-oil my K&N filter?

The cleaning interval depends on your driving conditions. In normal conditions, clean and re-oil every 50,000 miles. Inspect the filter more frequently in dusty environments.

What kind of oil should I use on my K&N air filter?

Use K&N filter oil to properly re-oil your filter after cleaning. Other oils may damage the filter material or not provide adequate filtration.

Does this filter come pre-oiled?

Yes, this K&N filter comes pre-oiled from the factory, ready for installation. You do not need to oil it before initial use.

K&N Universal Round Tapered Filter 3 inch FLG / 5 inch Bottom / 4 inch Top / 7 7/8 inch Height

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Specifications

Brand: K&N
Part #: RU-4690
UPC: 024844373694

K&N Universal Round Tapered Filter 3 inch FLG / 5 inch Bottom / 4 inch Top / 7 7/8 inch Height

Name: K&N Universal Round Tapered Filter 3 inch FLG / 5 inch Bottom / 4 inch Top / 7 7/8 inch Height
Brand: K&N
Price: 104.99 USD
Availability: InStock

$104.99

On Backorder — Expected to ship by Apr 2, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Washable, reusable universal air filter for custom intake setups. 3 inch flange.

Key Features

Washable — clean and re-oil for extended use
Reusable — save money compared to disposable filters
3 inch flange — fits a variety of intake pipes
Rubber flange — allows flexible and secure attachment

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.