I read an analysis of many different oil filters by an engineer who literally tore each one apart and measured stuff like how long the element was when removed from the can, how small a particle would pass thru, the materials used in construction for the filter, can, valves, etc. His results surprised me. I had been using Fram for years, and that was the worst on his list. The best for the money?
1. AC Delco
2 Puolator and Pure One
3-? the rest.
A lot of his ratings had to do with the ability of oil to be removed from the filter when the engine was not running, causing effectively a dry start til the filter was refilled.
My Mazda MX6 is prone to noisy lifters, and definitely quieted down after switching from Fram to Purolator. Hope this helps.
