How often should I clean this filter?

K&N recommends cleaning and re-oiling your filter every 50,000 miles under normal highway driving conditions. Depending on your environment, you may need to service it more often. Inspect the filter regularly and clean it when you see a buildup of dirt and debris.

What do I need to clean and re-oil my K&N filter?

K&N sells filter cleaning and oiling kits specifically for this purpose. These kits contain a cleaner to dissolve dirt and grime, and a special filter oil to restore the filter's ability to trap contaminants. Using the correct oil is important to maintain optimal filtration.

Is this filter legal for use in California?

No, this filter is not CARB-approved and cannot be used on pollution-controlled vehicles in California. Check your local regulations before installing any aftermarket part.

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Trusted Since 1957

Est. 1957

K&N Universal Clamp-On Air Filter 3-1/2in FLG / 6in B / 4-1/2in T / 9in H

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Specifications

Brand: K&N
Part #: RU-3690
UPC: 024844373304

K&N Universal Clamp-On Air Filter 3-1/2in FLG / 6in B / 4-1/2in T / 9in H

Name: K&N Universal Clamp-On Air Filter 3-1/2in FLG / 6in B / 4-1/2in T / 9in H
Brand: K&N
Price: 94.99 USD
Availability: InStock

$94.99

On Backorder

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

Universal clamp-on air filter from K&N. Washable and reusable, with a pliable flange for secure attachment.

Key Features

Washable filter — can be cleaned and reused
Pliable rubber flange — allows secure attachment
Universal fit — works on many applications

⚠️ 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.