No stated efficiency different between them?I think it was determined that the cheap one has a nitrile rubber anti-drainback valve while the expensive one uses a silicone rubber anti-drainback valve.
No published data that I'm aware of.No stated efficiency different between them?
The fiber and metal end caps are also shown in the cutaway picture on the boxes.As in the video above the 10,000 mile filter has fiber end caps much like the Fram Extra Guard and the 20,000 miles has metal end caps.
There have been a few downsides with eCore center tubes. Wide windows causing media blow-through, and have seen a few broken/collapsed cages. Most of that was a few years ago, and it seems the eCore center tubes are now "tweeked" to be better - ie, designers have learned from field failures.Champ Labs created(?) the plastic cage center. Good for high flow.
No real down side. Have seem anyone else use it, though Champ Labs
makes filters for others (AC, Wix) that has the cage.