K&N High-Flow Engine Air Filter for Mercedes‑Benz 33-2181 (1999–2012) — Washable, Reusable, Pre-Oiled

The K&N 33-2181 is a washable, reusable high-flow replacement engine air filter engineered to increase airflow and help your compatible Mercedes‑Benz maintain strong performance over the life of the vehicle.

This premium K&N replacement is built with multilayer cotton gauze media and a durable frame so it fits into the original factory airbox for quick installation. Rather than a disposable paper element, the washable K&N design is intended to be cleaned and reused—reducing waste and the frequency of filter changes. The 33-2181 fits a wide range of Mercedes‑Benz models from 1999 to 2012; it is pre-oiled and ready to install straight from the box.

How does this filter affect engine performance?

By allowing more air to enter the intake while still trapping contaminants, the filter can help the engine breathe more efficiently. Improved airflow often leads to snappier throttle response and can support horsepower and acceleration under real-world driving.

• High-flow multilayer cotton gauze increases airflow up to published gains.
• Pre-oiled media is tuned to balance filtration and performance.
• Designed to work with factory airbox dimensions for optimal flow path.

What maintenance does a K&N lifetime filter require?

K&N filters are washable and re‑usable; they do not need routine replacement like disposable paper filters. Under normal highway driving the filter typically requires cleaning about every 75,000 miles, but inspection intervals depend on local driving and environmental conditions.

• Clean and re-oil using K&N cleaning kit when performance or visual inspection indicates dirt build-up.
• Typical cleaning interval: approximately once every 75,000 miles under normal highway driving.
• Follow K&N directions to preserve media effectiveness and lifetime warranty eligibility.

Will this element fit my Mercedes‑Benz model?

The 33-2181 is produced to match factory replacement dimensions for many Mercedes‑Benz C, CL, CLK, CLS, E and other models from 1999–2012. Check the included vehicle compatibility list and confirm OEM part location before purchasing to ensure a correct fit.

• Compatible with popular models including C230, C300, CL500, CLK350, CLS500, and E350 among others.
• Fits directly into the factory air box without modification for most listed years and trims.
• If in doubt, verify fitment by comparing part number 33-2181 to your vehicle’s OEM filter reference.

Is there a warranty and environmental benefit?

K&N provides a limited lifetime warranty on many of its stock-replacement air filters; terms and limitations apply. Because the filter is washable and reusable, it can reduce the number of disposable filters sent to landfills over the life of the vehicle.

• Backed by K&N limited lifetime warranty for eligible filters.
• Washable design reduces disposable filter waste and recurring purchases.
• Proudly manufactured in the USA with durable construction.

Who is this for: The K&N 33-2181 is suited for Mercedes‑Benz owners who want an easy, long-lasting performance-minded upgrade that installs in minutes. It appeals to drivers seeking improved throttle response and airflow without repeated filter replacements, as well as enthusiasts who prefer reusable, track‑tested filtration built to OEM fitment specifications.

Features:

• Engineered power with premium air filter media
• Rugged construction and four layers of cotton gauze protection
• Clean once every ~75,000 miles under typical driving
• No-hassle limited lifetime warranty (limitations apply)
• Easy installation—pre-oiled and drop-in ready
• Eco-friendly reusable design, made in USA