Ok guys, I'm a newbie to this forum, but after reading 20 pages on this topic, I thought I'd throw in my two cents.
I worked for Baldwin Filters in Kearney, NE last summer as an intern. I'll share what I saw.
We made filters for quite a few of the manufacturers listed at the beginning of this thread. While sometimes it may only be one part number, maybe a few more, but that being said it is true.
And its not just oil filters for that matter either. They make filters for about anything automotive... air, oil, fuel, hydraulic, water seperators, coolant conditioners, and so on.
Baldwin makes all the materials for their filters, and other brands' filters they make IN HOUSE. They have HUGE presses, robotic welders, servo controlled pleaters, hot melts, huge ovens, thousands of rolls of filter materials, miles of rolls of steel sheet metal and so on so on. At any one time there are enough already made materials stored in house to produce one million filters, yes ONE MILLION filters without running anything but assembly machines. Thats a BIG inventory!! Not to mention the hundreds of thousands of finished parts they store too. And thats JUST the Kearney facility. They also have two other North Am. facilitys like "Nebraskan" said about 10 pages ago, Yankton SD, and Gothenberg NE. Every baldwin filter that is sold in North America is shipped out of the Kearney facility, so you can imagine the size of the place!!!
And when I left in Aug. to go back to school :-( They had just got corporate approval for a 360,000 sq ft. Distribution center expansion!!!
And yeah, they're owned by Clarcor, but it has little more significance than a title, and cut in pay and benefits for everyone who was there for the takeover.
On to filters... lol. I'm trying to bring back all those brain cells I killed and remember who all we made filters for. Here goes... AcDelco, CAT, Purolator, WIX, Fram, Napa, Motorcraft, John Deere, Donaldson, Hastings (since they own Hastings). And those are the ones I remember off the top of my head. And from seeing the PO's in the database.
Now I'm DEFINENTLY NOT saying that ALL of those brands of filters are ALL made by Baldwin, cuz that'd be dumb. But they do make some filters for quite a few other mfr's. I think a lot of people underestimate the sheer amount of filters that Baldwin actually makes!
They also do in house testing for all of their filters. I got to watch and help do some analysis in that area. They burst and cycle test their filters, along with testing flow rates, and holding capacity of the filter media. A typical filter will last for around a million cycles of 0 to whatever psi, and back to zero. Performed at 1 cycle per second. You can actually watch the filter pulsate, kind of like a heart beating.
It's been interesting to read and see who knows what, and who's blowin smoke. I can already tell there's a lot of smart guys here!! I'm not going to say I know everything, or even that I know very much. Cuz I don't know a lot about filters, and even less about oil!! But now you guys know what I know... thanks, and look forward to learnin more!!