Originally Posted by AuthorEditor
So, who makes Mobil 1 filters these days? Is it still Champion Laboratories? I've read several posts saying they are made by FRAM.
At least in the spin on type, still Champ Labs. During the brief Fram Champ alliance there was some name (Fram Filtration) overlap on some of the 'made for' filter brands, though construction still indicated who was really making the filters, eg., fiber endcaps, ecores, metal endcaps. When it comes to the cartridge type Champ 'may' sub out manufacture, thus the coo.
As an aside, you been on vacation awhile. In meantime your testing of the Puro flat spring bypass design has been referenced and linked several times. It's a good one.