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

The cleaning interval depends on your driving conditions. K&N recommends inspecting your filter every 12 months or 12,000 miles and cleaning it when you see a buildup of dirt and debris.

What do I need to clean and re-oil my K&N filter?

K&N sells Recharger kits that contain both the cleaner and the oil you need to service your filter. Always use genuine K&N products to avoid damaging the filter media.

Does this filter come pre-oiled and ready to install?

Yes, this K&N air filter comes pre-oiled from the factory and is ready to install directly into your airbox. No additional oiling is needed before the initial installation.

K&N 33-2005 Air Filter for BMW 1978-1991

Name: K&N Replacement Air Filter BMW F/I CARS 1978-91
Brand: K&N
Price: 104.99 USD
Availability: InStock

K&N Replacement Air Filter BMW F/I CARS 1978-91

$104.99

Only 2 left in stock

Washable and reusable air filter increases airflow and horsepower.

Key Features

Washable and reusable — clean and re-oil for extended use
Oiled cotton media — traps dirt and improves airflow
Direct drop-in replacement — installs in the factory airbox
10-Year/Million Mile Limited Warranty — covers defects in materials and workmanship

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

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!