Oil Filters

Oil filter collapse can happen to any filter. When this happens there is usually something wrong with the engine. I know this isn't popular, but for a short explanation check out this link.
http://www.machinerylubrication.com/article_detail.asp?articleid=398
If you go to Google and just type in "oil filter collapsed" there is enough there to keep you busy for a while. Bad things can happen to your engine in the event of filter collapse, don't let it happen to you.