I currently have a apex'i short ram intake on my celica. I know some filters are cleanable (k&n, wash and reuse). How can I tell the reuseable ones from the ones you throw away when they get dirty.

Also, ive read that there is some sort of "filter oil" that you use on the k&n reuseables. What is this oil/what does it do?

the difference is that a cheap cone filter is made with paper, while a k&n is made with cotton, thus the ability to be washable and re-usable. The filter cleaning kit for the k&n consists of a cleaning agent, and then the red colored oil that gives them the red look, the oil is there so that it can catch smaller particles than just dry cotton, and it also keeps the cotton from drying up and getting sucked into your intake. My advice is try running your filter under water and if i gets all mushy and stuff, then its paper, but otherwise you should have a cotton one that you can wash and re-oil and use.

***DISCLAIMER: this is not set in stone facts, this is just what i have learned from experience, so please to take my words to the grave. ***

if you buy a filter cleaning kit, it should have the instructions for you already. If not, its pretty simple. This is how i did mine, sprayed with product from kit, let sit for 15 minutes, wash under warm water, let dry, and put the oil that came with the kit on very lighty. Then let dry 30 mins, and its good to go!

just use the apexi power intake. its one of the best and no business of cleaning it with agents and etc. just gets annoying with the k&n filters. -R

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You might want to switch to cold water. Cotton + warm water is bad.

Question.

I got a Apexi power filter, when should I replace it?