But it DOES! You can easily see where oil can flow around the endcap, without the leaf spring stopping it.quote:
However, it is irrelevant if it goes back down or not. It does need to be sealed on the media pleats.
In fact, in looking at the pictures, I'm wondering if the leaf spring is CAUSING the endcap to pull loose. As the leaf spring pushes on the ID, perhaps there is bit of a diaphragm effect causing the OD of the endcap to want to pull away from the media at the periphery.