I don't use Fram but I bet they would be serviceable, cardboard and all, for a 3000 mile change interval.
You have to remember that it's just a paper filter element the cardboard is holding in place.
That said, I wouldn't put one on any of my vehicles.
The Purolators and house labeled Purolators from Pep Boys, AAP, etc. are the same price or cheaper and are better constructed.
As for the OP's question, the OE Mopar would be fine at 12,000 km.
If I were concerned at all about its use, I would put a Pure One on that Mopar and be confident that it will go the distance.