K&N Engine Air Filter 33-2998

For a car that spends most of its time on regular highway drives, replacing a disposable engine air filter over and over can feel like a small but recurring chore. The K&N 33-2998 takes a different route: it is washable and reusable, and is listed for select DS, Citroën, and Peugeot vehicles from 2003–2019.

Its appeal is less about a dramatic upgrade and more about keeping a serviceable filter in the factory air box instead of buying another disposable one. Check the exact vehicle fitment before ordering, the supplied information names models but does not specify engine or trim details.

Key specifications

This is a reusable engine air filter made with multiple layers of cotton gauze treated with a tackifying agent. K&N says the layers are designed to trap contaminants while allowing airflow, and that the filter is pre-oiled and ready to drop into the factory air box. The listed part number is 33-2998.

The stated cleaning interval is every 75,000 miles under normal highway-driving conditions. The five-year estimate assumes 15,000 miles driven per year, so it is not a universal schedule: dusty roads, stop-and-go use, and other driving conditions may change how often maintenance is appropriate. From the way it is set up, the main tradeoff is straightforward: fewer disposable-filter replacements, in exchange for cleaning and maintaining the reusable one.

K&N also says the filter is designed to support horsepower, acceleration, and overall engine performance. Those are design goals, not a guaranteed result for every vehicle. Its stated savings estimate—up to $125 compared with buying multiple corresponding OE disposable filters—uses a specific 200,000 miles of highway driving and MSRP comparison, so actual savings will depend on the vehicle and how long you keep it.

Who it’s for

It makes sense if you own one of the listed DS, Citroën, or Peugeot models, want a reusable alternative to standard replacement filters, and are comfortable cleaning a filter when needed. For example, a highway commuter could check the air box during routine maintenance and keep using the same filter rather than routinely discarding a replacement element.

A conventional disposable filter is the simpler choice for someone who would rather replace than wash and maintain a filter. This K&N listing also does not provide engine-specific fitment details, so the model name alone may not be enough to confirm a match for every version of a listed vehicle. You may want to skip it if you prefer disposable maintenance or cannot confirm that part 33-2998 fits your exact car.

Everyday use

The intended installation is direct: remove the old filter and place this pre-oiled replacement in the factory air box. That makes it a practical option for a routine filter change, rather than a modification that calls for a different intake setup. The long stated cleaning interval is based on normal highway driving, it should not be treated as a promise that the filter needs no attention in every environment.

Reusable construction can also mean less filter and packaging waste than repeatedly buying disposable elements. The tradeoff is that this filter needs cleaning instead of simply being thrown away. The product information does not give cleaning instructions or include details about any maintenance supplies, so factor that upkeep into your choice.

Before you decide

How often does it need cleaning? K&N states every 75,000 miles under normal highway conditions, with five years based on an average of 15,000 miles per year. Driving conditions can affect the interval.

Is it ready to install? The listing says it arrives pre-oiled and is designed to drop into the factory air box. Confirm the part number and vehicle fitment first.

Does it guarantee more horsepower? No specific gain is provided. The filter is described as designed to support horsepower and acceleration, but the result for an individual vehicle is not stated.

Should you buy it?

Choose the 33-2998 if your exact vehicle is confirmed on the fitment list and you value a reusable filter enough to handle periodic cleaning. It offers a different ownership routine from disposable replacements, with the potential for fewer repeat purchases and less filter waste over time. If easy replacement without washing matters more, or the fitment for your vehicle is uncertain, a standard disposable filter is the more straightforward route.