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

K&N recommends cleaning your filter every 50,000 miles under normal driving conditions. If you drive in dusty or off-road conditions, you may need to clean it more often. Use a K&N filter cleaning kit to properly clean and re-oil the filter.

Will this filter void my vehicle's warranty?

Using a K&N replacement air filter will not void your vehicle's warranty. K&N air filters are designed to meet or exceed OEM specifications, and the No-Hassle Lifetime Limited Warranty protects against defects in materials and workmanship.

Does this filter come pre-oiled?

Yes, this K&N air filter comes pre-oiled and ready to install. The filter uses a specially formulated oil to help trap dirt and contaminants, ensuring optimal engine protection and performance.

K&N 23-25 BMW 520i Replacement Air Filter

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K&N Engineering

K&N 23-25 BMW 520i Replacement Air Filter

Name: K&N 23-25 BMW 520i Replacement Air Filter
Brand: K&N Engineering
Price: 73.99 USD
Availability: InStock

$73.99

Washable and reusable air filter improves airflow and horsepower. Direct drop-in replacement for your factory air box.

Key Features

Washable and reusable — save money on replacement filters
Designed to increase horsepower — get more performance from your engine
Direct drop-in replacement — installs easily in the factory air box
Oiled cotton media — traps contaminants and improves airflow
Backed by K&N's No-Hassle Lifetime Limited Warranty

⚠️ 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

Will this fit your vehicle?

Compatible with 15 vehicles

Need Help?

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Since 1957

Family-owned

Product Details

K&N's replacement High-Flow Air Filters are designed to increase horsepower while providing exceptional engine protection, and are covered by K&N's No-Hassle Lifetime Limited Warranty.

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!