Originally Posted By: Brian Barnhart
Originally Posted By: Drivebelt
This sounds more like idle speculation. You have evidence for this? Besides, it isn't just plain fiberboard -- it's thermal-resin-reinforced fiberboard (AFAIK).
Call it what you wish, but there is no shortage of cases where start-up rattle was reduced or eliminated by changing out Fram oil filters. Fram’s ADBV is thin and floppy and its location is poorly controlled, which often results in poor sealing.
Since most “failures” of full flow oil filters cause no engine damage or significant wear and go unnoticed by the user, the manufacturer can get by with a lousy product. The ADBV can leak and all you get is start-up rattle. The filter can be partially bypassing all the time and it goes unnoticed and causes little if any damage. The only things the manufacturers worry much about is a filter that leaks, ruptures, or becomes blocked, all of which can lead to catastrophic engine failure.
Since there is typically very little detectable in-use difference between oil filters, the manufacturers use marketing to sell their product. That’s why we have crinkle paint for grip, wrench flats that aren’t usually needed, and to-each-their-own specmanship on filtering ability and capacity.
I open every used oil filter from all my engines. In doing so, I’ve found more than one filter that’s failed. I’ve seen split pleats, brittle pleats, and misaligned ADBVs. After looking at dozens of used filters of various brands, you learn which brands are usually in good shape at the end of the OCI, which brands often appear spent at the end of a normal OCI, and which brands are more prone to fail.
From your own observation, which brand is prone to fail, and which brand is in good shape at the end of OCI?