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

K&N recommends cleaning and re-oiling your filter every 50,000 miles for normal highway use. If you drive in dusty conditions, you may need to clean it more often. Inspect the filter regularly for excessive dirt buildup.

Do I need to buy special oil for this filter?

Yes, this filter requires special filter oil to maintain its filtering properties. K&N sells filter cleaning and oiling kits specifically for this purpose. Using the correct oil ensures proper filtration and prevents damage to the filter.

What is the warranty on this air filter?

This K&N air filter is backed by K&N's 10-Year/Million Mile Limited Warranty. This means K&N will replace the filter if it's defective in materials or workmanship. The warranty does not cover damage from misuse or improper cleaning.

K&N 33-2292 Air Filter for BMW 525i 2.5L-L6

Name: K&N 04 BMW 525i 2.5L-L6 Drop In Air Filter
Brand: K&N
Price: 68.99 USD
Availability: InStock

K&N 04 BMW 525i 2.5L-L6 Drop In Air Filter

$68.99

Only 5 left in stock

Simple drop-in replacement for your factory air filter. Washable and reusable, so it's the last filter you'll need.

Key Features

Washable — clean and re-oil for continued use
Direct drop-in replacement — fits right in the factory airbox
Oiled cotton gauze media — traps contaminants while improving airflow
10-Year/Million Mile Limited Warranty — K&N stands behind their filters

⚠️ 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 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!