K & N air filter
You should never need to replace it. If something is wrong with it, call us and more than likely, we'll replace it with a new one. Just have the air filter when you call. It comes with a Million Mile Limited warranty, so no need to waste money buying another if you don't need to.
On the same note, you want it looking pretty bad before you clean it. They work better as they get dirty, maybe around 20,000-30,000 miles. Look for when the dirt is clogging up past the screen like this:

And after you clean it, spray a very light coat on the filter and let it sit to soak in, then touch up any white spots you see. After that you are good to go.
We have a cleaning video here if you are interested
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