A family friend asked me to service their modded Subaru WRX STi. The car was purchased used with a Cobb intake system which presumably is equipped with a Cobb reusable engine air filter.
I found the engine air filter to be quite dirty so I saturated the filter using the Cobb air filter cleaner spray. After soaking for 15 min, I then rinsed the filter under warm water (faucet). There was almost no improvement in the condition of the filter.
So I got out the garden hose and blasted the filter from the clean side out. Most of the debris came out, but I repeated the process once more. After drying, I oiled the filter using the included blue oil until the filter was uniformly blue, then soaked up excess oil using a paper towel.
The filter now looks pretty good but I am wondering if I may have damaged the filter by blasting it with a garden hose. I have no experience with reusable filters so I am curious what the best practice is for cleaning a filter that is super dirty.
Last edited by The Critic; 08/19/19 02:18 AM.