I bought a new ac delco AF for my daily beater as it was on sale. The old filter went 26k miles including driving up and down the state of CA, west coast to east coast, up and down New England, and back to CA. I pulled the old STP red out and it wasn’t bad, probably could have gone another 15k or so more miles. But I decided to go ahead and replace it since I was in there.
Outside
Inside
Old vs New
Outside
Inside
Old vs New