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

Cleaning depends on your driving conditions, but K&N recommends inspecting the filter every 30,000 miles. If you notice a buildup of dirt and debris, it's time to clean and re-oil it. Use a K&N filter cleaning kit for best results.

What is the flange made of?

The flange is made from pliable rubber. This allows the filter to be mounted securely, even on applications that produce a lot of vibration. The rubber can also stretch up to 1/16 of an inch to fit in-between sizes.

Is this filter CARB-approved?

No, this filter is not CARB-approved. That means it cannot be used on pollution-controlled vehicles in California. Check your local regulations before installing.

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Trusted Since 1957

Est. 1957

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

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Specifications

Brand: K&N
Part #: RU-4180
UPC: 024844373687

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

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

$94.99

Only 6 left in stock

Universal clamp-on air filter from K&N. Washable and reusable.

Key Features

Washable and reusable — clean and re-oil for long filter life
3-inch flange — fits a variety of applications
Rubber flange — strong and pliable to absorb vibration

⚠️ 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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Fits these vehicles

Nissan Altima 2004-2006
Nissan Maxima 2004-2008

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.