Changed the air filter in the Charger today. Didn't look like it needed it but it was a bit passed the manufacturer's interval so I put one in. Noticed this on the old one and thought I'd post it, never seen anything like this on a filter.
I'm starting on the 4th year for the wix filter for my Van.
I just shake loose the large debris and stick it back in.
There's still a lot of life left in it.
Very nice information. If only all filters were required to put that information on the side we would be able to more easily spot good filters. Sorry filtration is very important to the health of the engine.