The K&N E-0654 is a washable, reusable replacement for the factory paper element in the 2.1-liter four-cylinder diesel of the Mercedes-Benz GLK250. Its cotton-gauze media is layered and oiled, which the manufacturer describes as engineered to improve airflow and capture contaminants. The element is designed to be cleaned and reused rather than replaced, so the higher upfront price is offset over time. The manufacturer says it is designed to increase horsepower and acceleration, but no specific output figure has been confirmed, so this listing does not quote one.
Fitment is the step to verify before you order. The manufacturer's listing ties this element to the GLK250 2.1L diesel, but year coverage varies across sources, so confirm your model year and VIN with the manufacturer first. The drop-in replacement filters are designed to install easily into your factory air box, so no housing modifications are needed. Owners on user forums describe the job as a T25 Torx removal of the airbox lid screws, with a flat-blade screwdriver for the engine cover. One owner reported the new element would not seat and close the housing, so make sure it sits fully forward before fastening the lid. Searches like "GLK250 2.1 diesel washable air filter" and "high-flow Mercedes GLK250 diesel intake filter" usually lead to this application.
The manufacturer states that its drop-in replacement filters are designed to fit the factory air box without modification. Confirm the model year against your VIN, since year coverage varies across sources.
Per the manufacturer, the element only needs cleaning every 75,000 miles under normal highway driving conditions. Harsher or dustier driving will shorten that interval.
The manufacturer lists a No-Hassle Lifetime Limited Warranty on its K&N air filters.
This is a beginner-friendly job that needs a T25 Torx driver and a flat-blade screwdriver to release the engine cover. Owners on user forums report that the airbox lid has several Torx screws, including some tucked under wiring harnesses at the rear, and that a dropped screw can be recovered with a magnet. Keep the screws in order, and wipe out the airbox before dropping in the new element. Seat the element fully before closing the lid. Do not over-oil the element after cleaning, since owners on user forums warn that excess oil causes problems.
