How often should I clean my K&N air filter?

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

Do I need to oil this filter?

Yes, this is an oiled cotton filter. After cleaning, you'll need to re-oil it using K&N filter oil to maintain its filtration properties. A properly oiled filter ensures that dirt and contaminants are trapped effectively.

Is there a warranty on this air filter?

Yes, K&N backs this air filter with their No-Hassle Lifetime Limited Warranty. This means it is warranted to be free from defects in material and workmanship.

K&N 21-24 Ford E350/E450 Super Duty Replacement Air Filter

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Specifications

Brand: K&N
Part #: 33-5138
UPC: 024844402189

K&N 21-24 Ford E350/E450 Super Duty Replacement Air Filter

Name: K&N 21-24 Ford E350/E450 Super Duty Replacement Air Filter
Brand: K&N
Price: 78.99 USD
Availability: InStock

$78.99

On Backorder

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

Washable and reusable air filter. Drop-in replacement for your factory air box.

Key Features

Washable — clean and re-oil instead of replacing
Reusable — lasts the life of your vehicle
Oiled cotton media — traps contaminants
Designed to increase horsepower — improved airflow vs. paper filters
Direct replacement — fits in your factory air box

⚠️ 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 this vehicle

Ford E-350 Super Duty 2021-2025

Product Details

K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's No-Hassle Lifetime Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!