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WARNING: This website contains ingenuity, do not try this at home.

WARNING: This website contains ingenuity, do not try this at home.

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K&N Air Filter Cleaning

With 18,000+ miles over 5 years of some hard driving my MPG’s began to decrease and my filters seemed like a good place to start. The great thing about K&N air filters is their ability to be cleaned and re-oiled with one of their recharge kits for a fraction of the cost of a new filter (or in my case- two filters).

Here are the dirty filters with no hint of the red color K&N is known for.

The recharge kit which comes with a spray bottle of cleaner, and squeeze bottle of oil.


I began by spraying the filter inside and out, drenching the filter media.

I then let them sit for ~10min making sure the cleaning fluid didn’t dry. Just look at the amount of dirt that is coming out.

I then washed the filters from the inside out to rid of dirt and cleaner.

Upon inspecting the filters after the first rinse I was unsatisfied with the cleanliness of the filters. After all, the turbo’s have been sucking the dirt further and further into the filter media. So, I resprayed them and repeated the process. You can still see some dirt draining away during this second cleaning.

I washed them again and set them aside to dry naturally.

I then began re-oiling the filter, just applying oil to the crowns of the pleats.

I then let them set after I oiled them to allow the oil to be evenly absorbed throughout the filter media.

All clean, and dry, and back on the engine.