I had been neglegent in replacing my cabin filter. Refused to pay big bucks for it at AutoZone, and Wal-Mart doesn't carry them. Kept forgetting to order one at RockAuto.

Found one at the salavage yard. Look at the difference between real old and slightly old.

Damn, that old one looks horrible. I replaced mine a couple months ago, and it was about half as bad as that.

I change mine every other oil change. Even with just 10k on the filter it'* disgusting.