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.
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.