How often should I clean and re-oil my K&N air 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 or off-road environments.

What is the warranty on this K&N air filter?

This K&N air filter is backed by K&N's Million Mile Limited Warranty. This means K&N warrants that the filter will perform properly for one million miles, assuming proper cleaning and oiling intervals.

Do I need to purchase a special cleaning kit for this filter?

Yes, you'll need a K&N filter cleaning kit to properly clean and re-oil your air filter. These kits contain both the cleaner and the oil needed to restore your filter's performance.

K&N E-3804 Round Air Filter

Name: K&N 16-1/4in OD / 14-1/2in ID / 3-1/2in Height Round Air Filter
Brand: K&N
SKU: k-n-engineering-k-n-16-1-4in-od-14-1-2in-id-3-1-2in-height-round-air-filter-t14-472269
Price: 135.46 USD
Availability: BackOrder

K&N 16-1/4in OD / 14-1/2in ID / 3-1/2in Height Round Air Filter

$135.46

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 designed to increase airflow and horsepower.

Key Features

Washable — clean and re-oil for extended use
Reusable — lasts the life of your vehicle
Oiled cotton media — traps contaminants better than paper filters
Designed to increase horsepower — improved airflow adds power

⚠️ 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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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 10-Year/Million Mile 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!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!