Depending on the make and model of your vehicle, the air filter may be flat, circular or conical in shape. The methods used to clean the filter will be the same regardless of its design. [2] X Research source You may also want to stick a towel or some other object into the air intake port to keep debris from entering the engine after the filter has been removed.
If your filter looks clogged or fuzzy, or if it’s lost all traces of its reddish oil coat, it’s probably due for a cleaning.
You can also use a soft-bristled brush to remove dust without harming the filter. To avoid making a mess, it’s recommended that you remove your air filter outside.
Use as much solution as you need to completely coat both sides of the filter. K&N’s proprietary air filter cleaning solution can be purchased online or wherever auto accessories are sold.
Be careful not to let the cleaning solution dry on the filter.
Rinsing from the outside in will just force dirt further into the filter. [8] X Research source If your air filter happens to be especially filthy, you may need to repeat the cleaning and rinsing process more than once in order to restore it to a like-new condition.
Set the filter on a clean, dry towel to absorb more water. For quicker drying, make sure you leave the filter in a well-ventilated area at a mild temperature. [10] X Research source
Do not attempt to apply oil while the filter is still wet. [12] X Research source If need be, you can temporarily install a regular disposable air filter so that you’ll be able to use your vehicle while your K&N filter finishes drying.
K&N air filter oil contains a subtle red dye that makes it easy to see how much of the filter you’ve covered. By the time you’re finished, the entire filter should have a reddish tint to it. Use a paper towel to wipe away excess oil around the edges of the filter and work the oil more evenly into the pleats. [14] X Research source Be sure to work outside or in another well-ventilated area and spray the oil away from your face.
Oil is used to help the filter collect dust, dirt and other debris as it enters the air intake. The oil also serves to protect the filter from deterioration, extending its lifespan.
Even though K&N air filters are designed to last, you should still get in the habit of checking the condition of your filter every 25,000 miles. [17] X Research source If you placed a stopper in your air intake, don’t forget to remove it before reinstalling your filter.
